See: DRAFT REPORT on the implementation of the Return Directive (2019/2208(INI)) (pdf)
From the explanatory statement:
“This Report, highlighting several gaps in the implementation of the Return Directive, is not intended to substitute the still overdue fully-fledged implementation assessment of the Commission. It calls on Member States to ensure compliance with the Return Directive and on the Commission to ensure timely and proper monitoring and support for its implementation, and to enforce compliance if necessary.
(…)
With a view to the dual objective of the Return Directive, notably promoting effective returns and ensuring that returns comply with fundamental rights and procedural safeguards, this Report shows that the Directive allows for and supports effective returns, but that most factors impeding effective return are absent in the current discourse, as the effectiveness is mainly stressed and understood as return rate.”
See: DRAFT REPORT on the implementation of the Return Directive (2019/2208(INI)) (pdf)
Parliamentary procedure page: Implementation report on the Return Directive (European Parliament, link)