You are trusting him he has the same batch and not just using the same COA for other batchesHow often should we see a new test for a previously tested batch of whatever? (Honest question. Not a critique) there is possibility for degradation but I would also like to know, relatively, when the batch was created.
If he really has the same batch I'm happy no need to retest at least if we are talking of a reasonable time 6/8 months? There is a level of minimum trust that needs to be there on these things.