The College of Policing has updated its mental health authorised professional practice (APP). It is a wide-ranging set of documents, including detailed material upon mental capacity. It is important to note for social workers and healthcare professionals that this is likely to be the material that police officers will have been trained upon (if they have indeed received any training at all). Whilst the material is for the most part excellent, and lucidly clear, it is unfortunate that the section on mental capacity repeats the canard that s.4B MCA in some way provides authority to deprive a person of their liberty outside the scope of an application being made to the Court of Protection. Section 4B only applies where an application has been made; it should therefore never be relied upon by police officers to remove a person from their home absent an order having been sought from the Court of Protection.