During the raid, police recovered 350 glassine-type bags of what is believed to be heroin, officials said.
Lab tests continue on the heroin found in Hoffman's apartment, but a law enforcement official said that preliminary test results showed the heroin does not contain fentanyl. Fentanyl-laced heroin has been linked to the deaths of several people. Fentanyl is a powerful narcotic normally used to treat the pain of cancer patients.
In January, it was reported that at least 22 people died after using heroin mixed with fentanyl in western Pennsylvania. Just last week, officials in Maryland said heroin laced with fentanyl had taken at least 37 lives since September.
Reportedly, authorities have discovered that Saturday night, the evening before Hoffman died, he withdrew $1,200 from a grocery store ATM near his apartment, using six transactions.
Early, it was reported that a witness told investigators that he saw the actor speaking to two men wearing messenger bags at about 8 p.m. Police are also reviewing surveillance video for additional clues.
A private funeral service for family and close friends of the actor will be held in New York, and plans are also under way for a memorial service later this month, but no information on specific dates is currently available.
Tonight, the Broadway theater district will dim its marquees for one minute at 7:45 p.m. in his memory.