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This is actually a good point. Under current law they aren't going to be able to use one to gather evidence without a warrant, but if they already have a warrant it might make raids safer. Assuming the tech is any good, that is.

Exactly. As long as they can get usage under control by making them warrant only, sounds like a good way to start demilitarising the police. Hard to justify going all SWAT if you can see a house contains only two unarmed people in bed.

Of course not, they can't tell the race of the inhabitant.

It doesn't sound like it can positively identify people; just pinpoint where they are in the house.

It could help determine if there are infants or children in the house before a raid.

Then again it really isn't hard to determine if there are children in a house without advanced tech...