Drug paraphernalia including bags of heroin, used syringes and a needle that was still sticking out of Hoffman's arm was discovered when police found his body, reported ABC news quoting law enforcement sources.
Police investigating the death of the 46-year-old actor had earlier said they found 50 bags of the narcotic but they increased the figures later.
Detectives are using the stamps on the bags and checking with nearby jurisdictions to track the origin of heroin.
They are also trying to determine the purity of the heroin and whether there were any additives, ABC said.
Police is also looking into the possibility whether Hoffman's stint in rehab this May affected his tolerance for the
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