Photo: Marijuana Citizenship Denials | Oswaldo Barrientos – AP

Oswaldo Barrientos walks among marijuana plants at the grow facility where he works near downtown Denver on Wednesday, April 3, 2019. He said U.S. immigration officials blocked his application for citizenship because he works in the marijuana industry. Barrientos was brought to the U.S. from El Salvador illegally as a child and started working in the industry in 2014.