A few times, I used to work in a club when I was a teenager, doing all the lighting effects. As I got older I left and got a job as a security guard, but I did return to the club for a few months one summer to work on the door.
Putting things in drinks got you kicked out, just like any other drug. The cops would never be called if someone was just taking some drugs, but if they where putting something in someone elses drink the owner would normally insist that the cops be called, other times he would just tell us to “make sure he learns not to do that”.
If it happened today now that im not working on the door, it would depend. If it where friends or a family members drink then you would get a pasting. If it where a strangers drink, the door man or owner would be told, then the owner of the drink would be told.
EDIT: After watching the video, I should just point out, that it is not as easy to spot as in the video. Normally, they will drug the drink right in front of the person they intend to drug. They will make a pointing gesture and just drop it in, or they will wait for them to turn their head a moment. or, sometimes they would buy a drink and drug it on their way to the table. It is not easy to spot at all.