Both Nevada and OTI require each authorized trainer to display their trainer card in a conspicuous manner at each location, where they provide an OSHA 10 or 30-Hour course. No person other than an authorized trainer with a valid card may teach these courses (guest speakers may assist; however, the authorized trainer must still be present). The card will have the instructor’s name, the OSHA Training Center where the trainer received his card, and the card’s expiration date. Authorized trainers are required to renew their cards every four years.