Most end users that have stopped emotion any effects from the drug will no longer have detectable traces in their blood and won’t fail a blood-sample drug check. Via the 24-hour mark, all traces of LSD have disappeared through the bloodstream. Hofmann didn’t find the drug’s hallucinogenic consequences until 1943 https://bookmarkfox.com/story3126989/about-how-long-does-lsd-stay-in-system