A shrinking black market for marijuana was among the biggest benefits Colorado would realize from legalizing and regulating the drug, proponents of Amendment 64 promised in the months leading up to the state’s historic decision to sanction pot’s recreational use.

However, the black market is thriving — and growing in new, unforeseen ways as marijuana, highly potent THC concentrates and THC-infused foods and drinks produced in Colorado make their way across the country.