This study from the Council of Europe Parliamentary Assembly (PACE) provides an overview of issues relating to immigration detention practices, and promotes the use of alternatives to immigration detention of children (ATDs). The study argues that the main idea behind ATDs is identifying options which provide state authorities with a degree of control over asylum seekers while allowing for a basic freedom of movement. ATDs need to be regulated in order to avoid the arbitrary imposition of restrictions on liberty or freedom of movement and, even when alternatives apply, access to legal aid should be given to migrants, especially to children.

https://edoc.coe.int/en/migration/7533-a-study-of-immigration-detention-practices-and-the-use-of-alternatives-to-immigration-detention-of-children.html