Edited sentence: Gilbert v California :388 US 263-267 (1967).Nothing to do with permission to do a psychological analysis is implied.They are all related to obtaining samples for comparison with documents, sound recordings etc and used to determine whether the individual who provided the sample, is the same person as created the evidence that they have.US v Dionisio :410 US 1 (1973) 1973, Lawyers Edition, Second Series 35, 67; 93 SC 774.US v Mara aka Marasovich :410 US 19 (1973).US v Rosinsky :547 F 2nd 249 ( CA 4th 1977 ).United States v Wade    :388 US 218, 221-223 (1967).Very often graphologists will state that handwriting analysis in the workplace is legal, and cite one or more of the following cases: