Law and Order

How come anyone who is questioned by detectives on Law and Order seems to have no problem continuing on with their activities while being interviewed by the fucking police?! I'm sorry, but it seems to me that would be a little nervewracking, but apparantly the man working in the office who is being questioned about a double rape or murder or whatever; he can't seem to tear himself away from the copy machine to talk to a couple of cops. I'll remember that if I ever get in trouble for something.