Umm, I hooked an ac up, exhausted it through a window, and went outside and could smell the babies plain as day. PITA as I immediately had to go back in and uninstall it. 5 units hooked to an outside wall sounds like window units to me, not split system. Not that the cops wouldn't be above lying, but in this case it's very possible the idiots inside let them get a whiff. It's not like these guys were highly intelligent about their operation....showing up at the grow store so much in a limited time frame, keeping all the warehouses titled the same to make it easy for the cops to connect and take them all down are just two boneheaded mistakes. It's just not that farfetched to me that they pulled another boneheaded move and exhausted the smell to the exterior.