[Ken H]

They have to check out what the tip says.

Yes, we already agreed on that they have to "check out" a tip.

They failed to "check out" this woman or the tip about her home prior to launching an armed raid.

Agreed?

[A CA Guy]

They had the wrong information and went in on that, so they had no clue as to who was in there.

But if you are saying a look in the telephone book would have saved a life here, well not really in this case.
They wouldn't trust public information since a drug house usually operates out of a previously legitimate joint.

It was a tough call. but they should investigate how the tip was wrong.