 If you liked
110-Ban wa Uketsukemasen!
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 ...then you might like
Ai no Binzoko.
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The Ai no has a couple of police themed stories, but my rec is for the one in ch3. It's similar to 110-ban bc in both stories, we have two colleagues who graduated out of the same police academy and end up working at a police booth. One of them is more diligent than the other, and the uke realizes is feelings for the seme first.