If you are looking for a free without piracy, check Pluto TV, Tubi, or Freevee. These platforms rotate their catalog. While you cannot always choose the specific episode on demand, they often have a dedicated Mentalist channel running Season 1 on loop.
A unique bottle episode where Jane is temporarily blinded by a bomb. It showcases that his skills are entirely auditory and cognitive, not magical. the mentalist season 1 link
Main cast and characters
A visceral episode where the team investigates a murder that forces Jane to confront the ghosts of his former "psychic" career. If you are looking for a free without