Rraamjet
Dont talk to these low life as any meaningfull descusion with them is pointless.
If they see you as a threat then one of them will say that they suspected you had been drinking and the police will get called and you will have to do the whole test thing despite being clearly a "set up ".
Just take the pi$$ in a subtle way and if you see something that you dont like report it via official channels.
Security is to important to be left the politicians and the waisters that see it as the latest way to make a fast buck by employing lowlife at a pitance and charging the industry a fortune , but even a hint of descent is so un-PC that you can forget rational treatment from anybody !.
The trouble is that these people are so busy making a fast buck that real security is of no interest to them.