Green-card holders may want to think twice about celebrating 4/20 too publicly this year. That is because U.S. Citizenship and Immigration Services (USCIS) issued guidance a day before the unofficial marijuana holiday that makes clear working in the marijuana industry, or even just possessing cannabis could be grounds to reject a citizenship application—regardless of whether it is done in a state where it is legal.

Violations of federal marijuana laws “are generally a bar to establishing good moral character for naturalization, even where that conduct would not be an offense under state law,” according to the guidance issued Friday. Merely being “involved in certain marijuana-related activities” could be sign that an applicant for citizenship “may lack good moral character” regardless of whether “such activity has been decriminalized under applicable state laws,” according to the USCIS statement.

mmigration lawyers who work in states where marijuana is legal say they have been dealing with this issue for a while now, leading Denver Mayor Michael B. Hancock to send a letter to Attorney General William Barr asking for clarification about policies that have been affecting immigrants. This isn’t just a theoretical issue either. CNN reports that two immigrants who have lived in the United States for more than two decades were told they were not eligible for naturalization due to their work in the marijuana industry. “I work hard in an industry that offers opportunity and that’s unquestionably legal within the state. For the government to deny my citizenship application because I’m a bad person is devastating,” one affected immigrant tells CNN.

Advocates for legalization say the guidance is more a reflection of the government’s anti-immigrant attitude than about drugs. “I don’t think this is about marijuana at all,” said Michael Collins, national affairs director of the Drug Policy Alliance. “I think this is about them using the war on drugs to go after migrant community and that’s what they’ve been doing since Day 1.” A total of 33 states and the District of Columbia have legalized medical marijuana while 10 states and D.C. have legalized recreational marijuana.