He does have a history of drug use. We don't know how...
He does have a history of drug use. We don't know how recent, or if any drug use occurred up to the time of his death. We just need to rule it out before we close the case.
He does have a history of drug use. We don't know how recent, or if any drug use occurred up to the time of his death. We just need to rule it out before we close the case.