The Commissioner of the Metropolitan Police is calling for mandatory drug-testing at work.
Sir Bernard Hogan-Howe says that anyone failing a drug test and refusing to get help should face the sack.
He wants it to cover all occupations, but the special focus would be on teachers, transport staff and health staff working in intensive care.
The law says workers must consent to being tested, but can face disciplinary action in certain circumstances if they refuse.
More top news
Police investigating the murder of a grandfather from West Ham have arrested a second man on suspicion of murder.
Police are appealing for information after a woman was killed and three people injured after a crash in east London.
A restaurant where pets and their owners can share a meal together has opened just in time for Valentine's Day.