I arrived in CDG 2 days ago from BEY (wonderful flight by the way with regular C-service, bubbles, choice of several hot meals, etc.). On arrival in 2E we were greeted by some airport staff checking the PCR-tests. As far as I could see they were only looking for the magic words "PCR" and "negative" and checked the date when the test was done. All done within maximum 3 seconds, so that leaves one second for finding "PCR", one second for "negative" and one second for the "date".