i only know two
http://www.mangago.zone/read-manga/110_ban_wa_uketsukemasen/
http://myreadingmanga.info/draw-two-draw2-pat-rush-eng/
⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
there is also
http://www.mangago.zone/read-manga/kyokan_hunter/
Honto Yajuu: http://myreadingmanga.info/yamamoto-kotetsuko-honto-yajuu-like-beast-vol-08-eng/ romance between a cop and a gangster. really cute. Worth reading even if it's not the one you're looking for.
Mezase hero
Can anyone give me a list of yaoi that have to do with cops I'm looking for a specific yaoi but I don't remember much about it. Tysm!