Is it true that if you took acid (lsd) you cannot become an airline pilot?

Question

I have decided to become an airline pilot and i was remember been told by someone that if you ever taken acid you will fail the medical. In the past once i have tried magic mushrooms do they count or is there any truth in this could anyone tell me

Answer 1

 Acid is not traceable within your body, but it does create an air bubble in your spine that expands in your back at higher altitudes.