The Home Secretary told the House of Commons she had "long been concerned about the use of stop and search".
Theresa May said: "While it is undoubtedly an important police power, when it is misused stop and search can be counter-productive
"First, it can be an enormous waste of police time. Second, when innocent people are stopped and searched for no good reason, it is hugely damaging to the relationship between the police and the public. In those circumstances it is an unacceptable affront to justice."
More top news
It#s "unthinkable" that the UK will walk from Brexit talks without a deal at least covering security, Home Secretary Amber Rudd has said.
Ulster rugby stars Paddy Jackson and Stuart Olding are to stand trial on charges of rape, a Belfast court has ruled.
The Syrian city of Raqqa has been liberated from Islamic State militants, a senior commander for a US-backed force has said.