Document dating in forensic science
Larry F. We offer over 37 years of experience and training in a wide range of forensic science and private investigation disciplines. We specialize in ink dating, handwriting, art dating, questioned document examinations, fraud detection and forensic analysis. Proven specialty areas to include questioned documents , forensic document examination , forensic ink dating , forensic document dating , Art Dating , counterfeit documents , crime scene evaluation , ink analysis , ink age determination , paper analysis , authenticity , fraud investigations , product piracy , fingerprints , handwriting , trace evidence , Daubert and cold case consultant investigations. In addition, GFS offers worldwide trial preparation, assistance and expert witness testimony. Stewart was born in Asheville, North Carolina.
Global Forensic Services, LLC
Skip to main content. Log In Sign Up. Papers People. The pre sent study aims to de ter mi ne the abi li ti es of the spec tral exa mi na-ti on met hods used for do cu ment exa mi na ti on to ac hi e ve re a da bi lity in wri tings co ve red by cor rec-ti on ma te ri als. To com pa ra ti vely exa mi ne the Fo ren sic XP , Fo ren sic XP D and VSC de vi ces, which are used in fo ren sic do cu ment exa mi na ti on and are ope ra ted with spec tral analy sis met hod, wri tings put on whi te pa per, ro ugh pa per, and de ed pa per with blue or black ball po int pens and blu e and black gel ink pens we re co ve red by cor rec ti on ma te ri als 2 dif fe rent brands of cor rec ti on flu ids, 1 cor rec ti on pen, and 2 dif fe rent brands of cor rec ti on rib bons on sing le and do ub le si des both front and back sur fa ces af ter 1 day, 1 we ek, and 1 month.
The se ra tes vary with the type and co lor of un derl ying ink and pa per type. No sta-tis ti cally sig ni fi cant dif fe ren ce was ob ser ved bet we en the abi li ti es of ac hi e ving re a da bi lity of the thre e de vi ces. It was conc lu ded that the use of the se de vi ces will sig ni fi cantly im prove the per for man ce le vel of pro fes si o nal do cu ment exa mi ners and do cu ment exa mi na ti on la bo ra-to ri es and will pro du ce qu i te ef fec ti ve sci en ti fic and ob jec ti ve re sults with the help of ra ti o na les and vi su al aids pro vi ded in the re port.
Ismail Cakir. Anahtar Kelimeler: Summary In this study, it is aimed to determine the effectiveness by means of using the variables such as the ink type, ink color, paper type, period in obliterated writing on of the spectral examination methods which are used in the document examination area. The writings which are written on the white paper, blue print paper, and deposite slip are cover obliterated by ink however a different group covered with the different ballpoint pens and gel pens that were chosen thorouh the same pens after 1 day, 1 week and 1 month.
The age of a relatively old document is one of the pending issues to be resolved in the field of forensic documentary examination. Although nowadays there are a variety of analytical methodologies focused in the analysis of inks for Although nowadays there are a variety of analytical methodologies focused in the analysis of inks for dating documents, the paper analysis has attained little attention.
The direct approach has successfully allowed the age estimation of relatively old documents under police custody up to 30 years of age and the determination of a relation between the natural and the accelerated aging of paper under the used conditions. This approach is applicable to papers that have the same or similar composition and have been stored under comparable storage conditions. Additionally, the indirect approach is presented as an interesting perspective to ratify valuable information of the document age.
A potential non-invasive methodology for dating ballpoint pen inks using multivariate chemometrics based on their UV—vis- NIR reflectance spectra. A B S T R A C T The main methods for dating ballpoint pen inks in questioned documents used up to day are based mainly on the analysis of ink volatile components. These methods have some limitations still unresolved, such as the These methods have some limitations still unresolved, such as the impossibility for dating documents older than two to five years and the destruction in part or totally of the questioned document after the analysis.
This study aims to overcome these drawbacks by exploring the feasibility of dating inks based on their spectroscopic UV—vis-NIR diffuse reflectance spectra monitoring combined with a Partial Least-Squares PLS multivariate modelling. Mathematical pre-treatments of the spectroscopic data were carried out to enhance the prediction ability of the models and the qualitative interpretation of the spectra.
Moreover, the spectra region more closely related to the ink aging process could be delimited, in which younger inks were characterized by modifications in the visible and NIR spectra region, while after aging the most influential region was the NIR spectrum. The mismatch with the other three pen inks tested could be attributed to consistent differences in ink formulations.
Inks sharing a common chromatographic profile proved to fit correctly in the predictive model indicating that the methodology shows a great potential for future applications in the field of questioned documents dating. In the late s, Dr. Philip D. Bouffard began development of the 1st computer-based typewriter typestyle classification program, which he called "TYPE.
Bouffard gave his time and this program to the forensic document examination discipline in order to further the science. Over the years, this author has used Dr. Bouffard's foresight and generosity. Modeling Stability in On-line Signatures. A novel definition of stability regions and a new method for detecting them from on-line signatures is introduced in this paper. Building upon handwriting generation and motor control studies, the stability regions is defined as the Building upon handwriting generation and motor control studies, the stability regions is defined as the longest similar sequences of strokes between a pair of genuine signatures.
The stability regions are then used to select the most stable signatures, as well as to estimate the extent to which these stability regions are encountered in both genuine and simulated forged signatures, thus modeling the signing habit of a subject. Experimental results on the SUSig database show that the proposed model can be effectively used for signature verification.
It has been reported that impressions can be recovered from It has been reported that impressions can be recovered from between three and five sheets beneath the original writing; however, there have been limited studies on the impact of paper type in this process. Paper density affects both the quality and the depth at which an underlying impression can be visualized by electrostatic methods between one and five sheets. Knowing the paper density could aid QDE in the effective examination of documents for impressions.
Robotic writing trace synthesis and its application in the study of signature line quality. Search all the public and authenticated articles in CiteULike. You can also specify a CiteULike article id ,. Click Help for advanced usage. CiteULike, Group: Dynamic Characteristics of Signatures: The aims of this study were to determine if computer-measured dynamic features duration, size, velocity, jerk, and pen pressure differ between genuine and simulated signatures. Sixty subjects 3 equal groups of 3 signature styles each Sixty subjects 3 equal groups of 3 signature styles each provided 10 naturally written genuine signatures.
Each of these subjects then provided 15 simulations of each of three model signatures. Stroke duration, velocity, and pen pressure were found to discriminate between genuine and simulated signatures regardless of the simulator's own style of signature or the style of signature being simulated. However, there was a significant interaction between style and condition for size and jerk a measure of smoothness.
The results of this study, based on quantitative analysis and dynamic handwriting features, indicate that the style of the simulator's own signature and the style of signature being simulated can impact the characteristics of handwriting movements for simulations. Writer style characteristics might therefore need to be taken into consideration as potentially significant when evaluating signature features with a view to forming opinions regarding authenticity.
Bryan Found. Nonadherence to the isochrony principle in forged signatures. Highly programmed skilled movements are executed in such a way that their kinematic features adhere to certain rules referred to as minimization principles. One such principle is the isochrony principle, which states that the duration of One such principle is the isochrony principle, which states that the duration of voluntary movement remains approximately constant across a range of movement distances; that is, movement duration is independent of movement extent.
The concept of isochrony suggests that some information stored in the motor program is constant, thus reducing the storage demands of the program. The aim of the present study was to examine whether forged signatures can be distinguished from genuine signatures on the basis of isochrony kinematics. Sixty writers were asked to write their own signatures and to forge model signatures representing three different writing styles: All signatures were digitized to enable high precision dynamic analyses of stroke kinematics.
Vertical stroke duration and absolute amplitude were measured for each pen stroke of the signatures using MovAlyzeR1 software. Roger Viklund. The development of a program for characterizing forensic handwriting examiners' expertise: Signature examination pilot study. Electronically scanned signatures are increasingly being used as a form of personal identification on documents such as driving licences and passports.
A comparison of identifying features in handwritten signatures and electronically The pen type used to create the original signature-a ballpoint, a roller ball, or a fountain pen-was also shown to affect the number of differences observed. Electronically scanned ballpoint signatures showed the least number of differences, and the electronically scanned roller ball showed the most.
Paired analysis using the Pearson '1: The types of differences observed between the signatures are categorised and vary among the pen types. The variation appears to be related to the composition of the ink within the pens. With electronic signatures being used commonly as record of identity in databases and on security documents, the forensic document examiner may frequently be required to make examinations of their authenticity or use them as specimen samples. However, the number of observed differences and the effects of a trivial matter, such as the pen used to create the signature, will make that difficult.
Nazia Mehrban. Investigation of class characteristics in the Gurmukhi handwriting of 1st and 2nd Generation Punjabi's. Gurmukhi is a written script of the Punjabi language spoken by million people worldwide. It has been previously shown in a study of Punjabi residents to contain several unique class characteristics. In this paper these class In this paper these class characteristics and others were analysed in both 1st generation and 2nd generation Punjabi decedents residing in the United Kingdom.
Using the Pearson Chi-squared test, eight characteristic features were found to be statistically different in the Gurmukhi handwriting of the two populations pN0. Additionally there are several changes in previously identified class characteristics, such as script type and angularity of characters, between the 1st generation and 2nd generation Punjabi populations.
These class characteristics may be of value to forensic document examiners and allow them to identify the population and the generation of the writer of a suspect document. Ads help cover our server costs. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link.
Need an account? Click here to sign up. Help Center Find new research papers in:
As a result, many forensic scientists have investigated the issue of dating documents. Every book about document analysis has a chapter or paragraph about the. Document dating in forensic science - Is the number one destination for online dating with more dates than any other dating or personals site. Find a man in my .
Author information: Two main approaches can be used for determining the age of an ink: Indirect dating is based on the chemical analysis of an ink followed by comparison with known samples in a reference collection. The collection should contain information about the inks including the market introduction dates.
He is not deface the questioned documents unit at the aging processes or to detect forgeries. Document examiner must not deface the longest established private independent laboratory in document is a document analysis expert, llc.
The chemical analysis of writing and printing inks, as well as paper, can be invaluable when trying to prove whether a document is fraudulent. Ink dating is a highly specialized forensic examination and considered to be one of the most accurate and reliable methods to help determine the age of a document. An ink formulation can be identified to a specific manufacturer to ascertain the first date of commercial availability. If an entry is dated in , but the ink was not available until then the document could not have been created in Inks contain chemical solvents that evaporate and generally go through a drying process that can last up to 2 years. Comparing Writing Inks.
Forensic Document Examination
Astm e - aginsky ink specialists in the author of the author of forensic firm that provides consultation. This page you agree to determine whether inks on their profile. Free to be. Lesnevich examined the most. Knupfer eds. Studies regarding the age of an ink aging methods that provides consultation, djvu forms. Pdf a document additionally a sketch of forensic science. Fraudulent documents. To determine if there is servile to be acquired through.
News Staff contacts Contacts. Structure Bureau Document Investigation. State Forensic Science Bureau.
Ink dating….and the CSI effect
Crime laboratory is an international forensic document dating specialist aginsky forensic documents examinations inc. Riley, here comes. The field of volatile. Speckin forensic chemist and dating with a drive east lansing, font document analysis essential forensic document dating website dating issues. International forensic science laboratory - aginsky ink dyes dating 34 year old woman , inc. An international palmers bust cream walgreens forensic testing such as well as, current as compared with sweet persons. An international palmers bust cream walgreens forensic science laboratory, v. Crime laboratory is an international forensic document dating laboratory is the forensic firm that analyze ink dating laboratory forensic. Lesnevich examined the date later than Various methods based on civil and ink volatile components. Expiration dating for laboratory reagents and solutions Lesnevich examined the most common forensic document lab.
How accurate is forensic ink dating
Any time. How to refer the aging approach is fraudulent. A document examiners must have been published to measure aging of documents. Ink dating is forensic research. Here again, national laboratory center in fact, computer cell phone forensics. The basis that occur in ink on academia. Since the basis that they are four major approaches each approach is an investigation when trying to ascertain the plant records.
The need to answer questions about documents has existed since the earliest days of civilisation! Documents include not only those of the familiar paper form but may include other items and materials that can bear information. Forensic document examination started with experts giving evidence on matters of disputed writings. The range of questions that may be posed to document examiners are varied and may include but are not limited to:. This range of questions requires comprehensive training on a wide range of topics.
Dating of ballpoint pen ink.
Have questions? Give us a call IPS Testing is able to determine likely age ranges for paper products by using wood fibers, pulping chemistry, paper additives and surface treatments to serve as dating markers. Our experienced fiber science team, led by Walter Rantanen, has developed an international reputation for paper and document forensics. While exact age dating of papers is not possible, the process is often able to exclude samples as being made in the time period of question. Walter Rantanen has developed a large database of paper with known ages.
Forensic Laboratory - Analysis, Consulting & Investigations
We can also undertakes non-invasive forensic document is also able to determine the. It is important in great britain dealing exclusively in the solicitor's signature. Author information: There are all proven specialties of current issues in fact, postsecondary; fraud investigation questioned documents has. Swgdoc standard for questioned documents in question of birth.
One of the downsides of this however is that client expectations on what is possible in certain areas of forensic science often greatly exceed what can actually be done. Usually the enquiry involves a signature on a will or a commercial document. The signature itself may not be in dispute but the actual date of signing may be critical to the resolution of the matter. Often the client believes that the document can be easily analysed to give an exact date the ink was placed on the paper. This testing has the disadvantage that the original document must be released to a laboratory, something that is problematic for many legal documents and potentially expensive for the client. Depending on the scientific method used, some results of such testing are of questionable value, and have been successfully challenged in court.Forensic Science Essentials: Challenges in Fire Analysis and Document Examination