Police are investigating the disappearance of a trainee on a nine-month basic police learning development programme at the SAPS Tshwane Academy. Tristan Chowles, 23, was admitted to a hospital in Pretoria on Wednesday and discharged on Thursday.Police spokesperson Big Athlenda Mathe said the circumstances of his disappearance were being probed and a search was under way.Chowles is a white male, 1,78m tall, has short blonde hair and blue eyes. Mathe said a missing person case was opened at Garsfontein police station. “Members of the public who may have seen or have information on…