One regulator said the extent of the suspicious transactions would ‘explode your minds.’ This article was produced in partnership with ProPublica’s Local Reporting Network . A top regulator for Colorado’s Marijuana Enforcement Division acknowledged in a private meeting with industry representatives that the amount of chemically converted hemp being illegally sold as marijuana is far greater than the agency has publicly disclosed. The remarks confirmed testing by The Denver Gazette and ProPublica , which found signs of hemp in marijuana vapes sold at dispensaries, as well as reporting that regulators have discovered that some hemp-derived vapes were contaminated with a toxic chemical. The virtual meeting, an audio recording of which was reviewed by the news organizations, was convened by members of Colorado Leads, a marijuana industry trade group, in March to discuss a problem they said had “metastasized” and now posed an “existential threat” to the nation’s first legal recreational marijuana market.…