Cop threatened me with a house search?

Ok, so the cop who works at my school, he knows I smoke pot...he talks to me sometimes and he ALWAYS brings up the subject of it and asks me questions and ****...I dont want to sound suspicious, so I usually try to answer them (There usually just "So, how much do you pay" and other general q's) and sometimes he just says "How's the dope smokin' going?" and today he said "Well, based on what I know about you, I could go and search your house" And he was all like saying if I told him who smokes it at the school and who I get it from he wouldnt...of course I told him no. But...how is that possible? Is he just bluffing to attempt to pry information off me?