Early versions of the bill had Ketamine in it. It was villified as a "date rape drug". I don't remember why MDMA got removed, but babysteps if my guess.
With alcohol you can maybe put more spirits in a drink than you claim. It is not tasteless.
It definitely is harder to notice after the first couple normal alcohol content drinks.
I've played pranks on my friends like this in the past. They were surprised how wasted they'd been the night before.