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The NFL says Steelers linebacker James Harrison — like all other players — is barred from recording a drug test because of an agreement between the league and the players’ union that recording tests could undermine the integrity of the testing process.

After Harrison wrote that he was told he wasn’t allowed to record the surprise performance-enhancing drug test he got on Tuesday, NFL spokesman Brian McCarthy told PFT via email that the ban on videotaping keeps cheaters from learning ways to manipulate the process.

“A player may not film a drug test,” McCarthy wrote. “Both the league and NFLPA recognize that the collection protocols and procedures are designed to ensure the accuracy and identification of the specimens to be tested. To maintain the integrity of the protocols and protect against the possibility of manipulation of the process at the time or during future tests, the policy prohibits devices and other objects in the collection area or taking photographs or video of specific collections. There are a number of protections in place for both the player and collector to ensure that the protocols are properly followed. In addition to the multi-step verification of identity and confirmations of specimen and bottle integrity, the protocols expressly allow both the player and collector to note and report for investigation any perceived irregularity or deviation in the collection process.”

That explanation makes sense in light of the recent news that Russia schemed to cheat at the 2014 Olympics by replacing urine collected in drug tests with clean urine. In order to pull off that cheating program, Russia had to know details such as the types of cups used in the collection process and the numbers on the cups. If the NFL allowed drug tests to be recorded, it would be easier for cheaters to get that information.

And so everyone who was eager to see James Harrison urinating on Instagram will have to go away disappointed: That’s not allowed under NFL rules.