Two prostitutes were seen and one of them refused to speak to the police. A police officer followed one of them and grabbed her arm in an attempt to restrain her. She scratched the officer and was convicted of assaulting a police officer in the execution of their duty. CA allowed her appeal because, since the police officer was not trying to arrest her and merely requested her detention at the place, to physically detain her without arrest was unlawful and the police officer was not executing their duty. Therefore conviction was quashed.