In the collection of documents for the purpose of forensic document examination and hand writing idenfication with a questioned writing/signature, it is important to obtain documents with authentic writing/signatures. Documents signed in the presence of a ministry employee are an excellent source.
Bank Documents
Contracts
Court documents
Government ID: Drivers Licence, Passport
Having authentic and reliable source documents increases the accuracy of the forensic document examination. Originals are always preferable however if that is not possible, a photograph is often much more clear than is a photocopy. Taking photos of original documents and providing a JPG for examination is an option if originals are not permitted to leave an establishment like a bank or ministry office.
Bureau Forensic Document Examination Services: Official Website 