However, before they can do this, they must have a good reason and tell you why they are searching you.
Police officers don't have to be in uniform but if they're not they must show you their warrant card.
Being able to do this helps to keep the public safe, tackle crime, anti-social behaviour and prevent terrorism.
If you are stopped and searched it does not mean you are under arrest or have done anything wrong and does not automatically mean you will have a police record.
Watch our video to find out more about Stop and Search: