I never leave my drink unattended when going out. Jeffrey Dahmer spiked drinks. You never know who has devious motives on their minds out there.
But at least Jeffrey tried to control his addiction to necrofilia when he had a dummy, and when that failed, he tried to dig up dead bodies in cemetaries.
At least he tried, I will give him credit for that.
I have left drinks unattended just to observe what happens and have caught several women spiking my drink I played their game several times and left them dumbfounded...