; (2) include a national assessment of average trends across States with such programs in relation to the effects on economy, public health, criminal justice, and employment in the respective States, including with respect to the items listed in subsection (b); and (3) describe— (A) any barriers that impeded the ability to complete or update aspects of the study required by subsection (a)(1) and how such barriers can be overcome for purposes of future studies; and (B) any gaps in the data sought for the study required by subsection (a)(1) and how these gaps can be eliminated or otherwise addressed for purposes of future studies. (e) Best practices for data collection by States The best practices pursuant to subsection (a)(3) shall consist of best practices for the collection by States of the information described in the items listed in subsection (b), including such best practices for improving— (1) data collection; (2) analytical capacity; (3) research integrity; and (4) the comparability of data across States.