Archer and Cyril in “Training Day”

This is what a real field agent uses.

The point is a lot finer than I prefer.

That's because it's a hypodermic needle and the cartridge is full of a deadly super-toxin called poiso... caine. [puts the pen in Cyril's shirt-pocket] Keep it in here. But be careful, because the cap slips off for, like, no reason.