Such an exclusionary list was discussed by the British Advisory Committee on Drug Dependence in relation to personal appearance and dress. In relation to stop and search, the Code of Practice under the Police and Criminal Evidence Act extends the list to exclude a person's color, membership in a particular group, and previous convictions for possession of unlawful articles. Such lists of excluded factors could be further extended to include alibis which have not been checked and found to be untrue, refusal to give name and address, refusal to speak to or associate with the police, rude or insulting language or conduct, previous criminal record, and mere presence at a particular place at a particular time. Such guidelines would not only help protect civil liberties but would also standardize police powers and guide individual officers in exercising reasonable discretion. 11 footnotes.