Standard Guide for
Sample Chain-of-Custody Procedures1
This standard is issued under the fixed designation D 4840; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
Click below to download Astm D 4840 – 99 (Reapproved 2004) pdf free
Click here to download Astm D 4839 – 03 Pdf Free Download