Theoretical question - would it be possible to get so gassed up that if you peed in the pool you’d make everyone else test positive?

Ahh, the US-Russia summit in Geneva in June 2021.

U.S. President Joe Biden and Russian President Vladimir Putin, whose countries hold 90% of the world’s nuclear weapons, agreed at a June summit in Geneva to embark on an integrated bilateral ‘Strategic Stability Dialogue’ to lay the groundwork for future arms control and risk reduction measures.

Reuters - U.S. and Russia say they held ‘substantive’ arms control talks in Geneva

Simpler times.