While I agree that it's a sensible and logical idea, the police aren't babysitters.

You're found driving intoxicated, you get taken to the station, you get written up, and because you're not charged with something that requires you to be locked up, you're let go.

Plus the police probably have no right to detain you in that case.

But yes, I agree, letting them sober up safely at the station, would be wise.