9.3.3. ensure that their application is non-discriminatory, proportionate and necessary and that the individual circumstances and vulnerabilities of those to whom they are applied are taken into account and that the possibility of review by an independent judicial body or other competent authority is provided for; 9.3.4. commission and carry out empirical research and analysis on alternatives to detention, their use and effectiveness, and best practice, distinguishing between communitybased alternatives that allow for freedom of movement and those which curtail freedom of movement. In this respect, the following alternatives can, inter alia, be taken into account: 9.3.4.1. placement in special establishments (open or semi-open); 9.3.4.2. registration and reporting; 9.3.4.3. release on bail/surety; 9.3.4.4. controlled release to individuals, family members, non-governmental organizations (NGOs), religious organizations, or others; 9.3.4.5. handover of travel and other documents, release combined with appointment of a special worker; 9.3.4.6. electronic documents or electronic monitoring. 10. The Assembly invites the Council of Europe’s Commissioner for Human Rights and the CPT to continue to monitor closely the situation of the detention of asylum seekers and irregular migrants and to support the guiding principles laid out above in relation to legally permissible detention and minimum standards for conditions of detention. Furthermore, they are invited to encourage member states to examine and use to a much greater extent alternatives to detention.145 55