Police launch investigation after finding drugs in Bobbi Kristina's home

Los Angeles - Police have launched an investigation after finding drugs at Bobbi Kristina Brown's home.

Roswell Police Department are said to have discovered the narcotics shortly after the 21-year-old actress was discovered unresponsive in a bathtub at her townhouse in Atlanta, Georgia on Sunday, family sources have told TMZ.

While Bobbi - who is the only daughter of Whitney Houston and Bobby Brown - is currently "fighting for her life" in hospital, an investigation has been launched into the circumstances in which she was found after police conducted a second search of the property.

Her husband Nick Gordon and her ex-boyfriend Max Lomas were the first to arrive at the scene, and according to Fulton County Jail records, Max, 24, was arrested early last year on suspicion of drug dealing and was charged with possession and intent to distribute cannabis as well as possession of Alprazolam.

He was also charged with possessing a firearm or knife while attempting to commit a crime.

While the police department originally reported they had found no traces of drugs in Bobbi's home, they have since revealed they believe she may have been under the influence when she was discovered by the pair in the bathroom.

Bobbi - who is thought to have spent up to eight minutes underwater - has been placed in a medically-induced coma after being found with "no heartbeat".

Although she is said to have "opened and closed" her eyes a few times on Monday, a source close to the family said she remains on a ventilator in the intensive care unit and doctors have warned that they won't be able to tell if she has suffered brain damage until the sedatives can be reduced.