whitney houston*(Via LA Times) – The focus of the Whitney Houston investigation is shifting to an examination of the prescription medicines found in her room and whether she had taken any drugs that might have contributed to her death.

Police said detectives have ended their investigation at the hotel room where she died, but investigators continue to interview people while awaiting the results of toxicology tests.

“No matter what medication they may be taking, until we do a toxicology test and see the levels, we are not going to speculate,” said Ed Winter, a spokesman for the Los Angeles County coroner’s office.

Authorities have collected several bottles of drugs from Houston’s suite at the Beverly Hilton Hotel, law enforcement sources told The Times. But the sources said the amounts of drugs did not seem unusually large, leaving it unclear whether the medications had anything to do with the singer’s death.

Investigators are expected to speak to Houston’s medical team to learn of any underlying medical conditions she might have had. In previous high-profile death investigations, officials have interviewed those who prescribed drugs for the deceased. When Michael Jackson died, authorities spent weeks sorting out his large cache of prescription drugs.

Read/learn more at LA Times.