There you go - Due to the size of your obese body, I had to give you a full litre... Don't worry... It won't harm you - Now, are you a real policeman?
Yes... yes I am... Did you murder this man?
No... No I didn't...
Right then... Well, me not being a big believer in truth drugs, I'll blatently disregard this conversation seeing as you obviously think I'm a stupid twat and thus I am arresting you on suspsicion...