I say that police should be allowed to, though I suppose it would depend on how deceitful and painful the lie is to say if it is moral or a good thing to do. Sometimes you have to work in the gray area if you want results. That's what I think anyway. Sometimes you would never get something out of a suspect if the cop didn't lie. But I don't think that lying should be the first option used.
I'm 22 and I'm an art student.

I hope I was a little helpful.