Prioritise safeguarding
All your staff have a duty to consider the best interests of pupils in your school. This is covered in paragraph 2 of Keeping Children Safe in Education (KCSIE). This includes both the pupil you're considering searching, and all the other pupils.
Pupils also have a right to expect a reasonable level of personal privacy, under Article 8 of the Human Rights Act 1998. Any 'interference' with this right by your school must be justified and proportionate.
The need to safeguard all pupils by confiscating harmful, illegal, or disruptive items, and The safeguarding needs, rights and wellbeing of the pupil suspected of possessing these items, including the potential: Loss of privacy when clothes, bags or possessions are searched Loss of a sense of security, if they feel they are being monitored and/or searched without reason Impact on their dignity or reputation if