28 Pa. Code § 1171a.35
(a) An approved laboratory shall enter into the electronic tracking system the following information for each sample collected under § 1171a.28(c)(1) and (2) (relating to selection protocols for samples) and each test conducted:
(b) An approved laboratory shall keep for 4 years a paper or electronic copy of the certificate of analysis performed on samples submitted by a grower/processor or test samples submitted by the Department including test results not required to be entered into the electronic tracking system under § 1171a.29 (relating to testing requirements). The following apply: