Liberty is seeking a judicial review of the decision by the Metropolitan Police to search peaceful protesters en route to a non-violent demonstration at an Essex oil refinery.
Sir Hugh Orde, president of the Association of Chief Police Officers, has called for undercover policing operations to be authorised in advance by a judge.
The case of a Sikh pupil suspended from a Welsh school for wearing a wrist bangle is now likely to go to judicial review after the school concerned refused to adopt a more flexible dress policy and is seeking further legal advice.