Should I Admit Drug Use? Admit Drug Use - Permanent Ban Is it better to admit drug use to the United States Border Patrol? If you admit to drug use at a USA port of entry, you may be denied entry. Why?  The United States Customs and Border Patrol (CBP) treat the admission of drug use the same as a conviction. Drug convictions over the age of 18 and indictable drug convictions between the age of 16 and 18 render you inadmissible to the United States on a permanent basis.   ***There are exceptions, see below. *** You can[...]