Below are datasets which I find useful and often recommend to fellow researchers and students:

Occupational Licensing

Bureau of Labor Statistics, Current Population Survey: Data on certifications and licenses ( 2015 - )
       National time series survey data on whether respondents are required to have a license or certificate to do their job

Institute for Justice, License to Work: 2017 Report | 2012 Report
       State-level licensing requirements for 102 low to middle-income occupations across the U.S.

Institute for Justice, Jetway Robbery: Civil Asset Forfeiture
      Data on airport currency seizures by the Department of Homeland Security
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Knee Center for the Study of Occupational Regulation: Occupational Regulation Database
       State licensing data, including licensing applications; includes data on continuing education, reciprocity, and good moral                     character requirements

Knee Center for the Study of Occupational Regulation: Police Officer Licensing
       State licensing data for the minimum licensing requirements for police officers, including higher education requirements and               weeks of training

Mercatus Center QuantGov: Occupational Licensing RegData 1.0 (2020)
       State-level data for the text of licensing requirements

National Conference of State Legislatures: The National Occupational Licensing Database
       State-level licensing requirements for 48 occupations licensed in 30+ states; includes data on renewals, reciprocity and good               moral character requirements

General