A man suspected of drug possession lost consciousness while being arrested by police, and he has yet to regain consciousness.
The 51-year-old man was initially contacted by police for a bicycle traffic violation in the Stockton area of San Diego around 9:25 a.m. Thursday.
San Diego Police said he attempted to flee, but officers caught him in the 300 block of 31st Street and after a brief struggle, took him into custody.
Narcotics were found in his pants pocket, according to officers.
As the suspect was being processed at police headquarters for possession of narcotics for sales and resisting arrest, someone notices that he had passed out in the back of the patrol car.
Officers started doing CPR on him, and paramedics soon arrived to take him to the hospital.
Police said the man has not regained consciousness while being treated at a local hospital. He is in critical condition.
It's unclear what the man is suffering from.
The 51-year-old man will not be identified until his family is notified.