Every sample gets an identifier, a barcode, a position and an unbroken record of who held it and when. For environmental and geotechnical work a broken custody chain does not just lose data — it voids the result. Printable labels and a lab submission form come out the other end.
A typed signature with a timestamp is the same evidentiary standard as a paper form, provided the record is append-only — and this one is. Entries cannot be edited, only added to.