Whispers Under Ground (Rivers of London #3)

by Ben Aaronovitch

We didn’t bother to handcuff him, which surprised Agent Reynolds. Kittredge told her it was Metropolitan Police policy to avoid handcuffing suspects unless physical restraint is necessary—thus avoiding the risk of chafing, positional asphyxiation, and injury sustained by falling over your own feet and smacking your face into the pavement.