Amy Winehouse's Family Never Mentioned Prescription Rx

Amy Winehouse's family claims no illegal drugs were present in the singer's system at the time of death ... but there's a gaping hole, because they made no mention of prescription drugs.

A source close to the family would not comment on any prescription drugs, even though he and the rest of the family were categorical on illegal drugs.

The family says they have seen toxicology reports which discount illegal drugs. The family did acknowledge Amy had been drinking at the time of her death.