Part 3 117 Key points – Part 3: • Arrest must be based on reasonable suspicion, suspects must be informed promptly of the reasons for the arrest and must be brought promptly before a judge or judicial authority to determine the lawfulness and necessity of the arrest or detention; • Any force used during an arrest must be absolutely necessary and proportionate; • When planning operations to arrest terrorism suspects, senior officers have a responsibility to put in place a system that is robust and thorough enough to ensure that any errors are prevented or detected in time; • Every suspect in custody has the right to be promptly informed about his or her rights according to domestic law; to have someone of his or her choice notified of his or her arrest, detention, imprisonment and whereabouts; to challenge the lawfulness of his or her arrest and detention; to have access to legal counsel of his or her choice and to medical attention; • Torture and ill-treatment are crimes; and • Torture and ill-treatment are ineffective.