I dunno. As soon as someone knocks on their door asking to search the place your neighbors are going to know someone tipped somebody off so all bets on not "looking suspicious" are off. For the zoning inspectors' sake, I wonder if they're armed? My vision of a zoning inspector is someone dressed casually with a notebook and maybe a flashlight (perhaps even a civilian who is subcontracted by the county) and isn't the first person I'd send to investigate a possible meth lab.