Then why else would he say that unless it’s for a search? Cannabis has a very distinct smell that isn’t confused with other scents. Police don’t say that for absolutely no reason. If I would have acted nervous or scared and not stood up to him by calling him out and recording him I guarantee he would have acted different once observing his change in demeanor. If he really believed he smelled cannabis he seems like the type of officer to care about weed too why would he drop the subject after being called out and recorded.