Originally Posted by
Bluedriver
It's not important that the levels eventually go back down. What's important is the harm done while the levels are high. Pilots have been disabled permanently, or worse.
Elevated levels aren't the problem. TCP poisoning would show a much lower level. The blood test doesn't measure TCP in the blood. It does measure the enzyme that TCP poisoning destroys. Critically low levels of cholinesterase means that something has gone seriously wrong in your nervous system.