I didnt watch that video but I'm assume its how the CIA admitted to dosing people with LSD in bars? (MK Ultra)
Yes that happened decades ago... meanwhile we know plenty about LSD so rest assured its not being tested on unknowing pedestrians anymore for a long time.
Also realize how small the chance is that something like that would happen to you, it's incredibly small. You are being paranoid, I hope the prescription you are getting is supposed to help against that.
Let's hope those guys at the agencies are a bit more subtle in how they experiment with things like that, back then very little was known about such mind expanding drugs - not counting sage shamans of course - a lot has changed since then, though I have no idea how novel brainwash drugs would be tested - I wanna say on volunteers. You couldn't test for anything novel with a drug test yourself, those only test for common drugs that I assure you nobody has any reason to dose you with like that.
Forget about drug tests, your fears are irrational. Stop watching silly conspiracy type documentaries, they are designed to cause fear and paranoia and far too often are filled with nonsense and kooky shit. Although granted the CIA thing happened once upon a time.
It's like if you can't handle horror movies don't watch them if you don't want to get nightmares - and on top of that it's fiction.
If you want to INFORM yourself watch the opposite of conspiracy documentaries, like stuff by the skeptics society.