Yes, it would be obvious that increased police presence reduces crime.
People might notice you staring at them? That doesn't need telepathy.
If memory serves? I thought you had found lots of convincing documentation. Now you're saying you can't even remember for sure.
You're not busy making money off a predictable physical phenomenon that produces useful results, though. If you actually had telepathy, you'd be the greatest advantage poker player in the world.
If telepathy were actually real, then every poker manual would include a chapter on mental shielding techniques, right before the chapter on avoiding physical tells.
ETA: Hell, if telepathy were real, football Safeties would be drafted based on their ability to read the Quarterback's play before he calls it. Baseball coaches would be hired based on their ability to divine the next pitch and tip off the batter before it's thrown. If telepathy were real, there would be a whole sports industry for games of skill based on the competitor's mind-reading and mind-shielding ability. Chess would be a different game. Tennis would be a different game.