According to the NYPD a rolled up $20 bill that was found near Heath Ledger‘s body has tested negative for drug residue. However, CBS 2 in New York reports that several packets containing an “unknown substance” were found in the apartment. It’s not yet known whether any of these items belonged to Ledger or whether he ingested them. Six different prescription drugs, three of which had been prescribed in London where Ledger had been filming The Imaginarium of Doctor Parnassus, were found as well. The first autopsy to determine the cause of death proved inconclusive, but further toxicology and tissue testing should shed some light in 10 to 14 days, according to the medical examiner’s office.