With medical marijuana legal in 23 states and Washington, D.C., and recreational marijuana legal in Colorado and Washington state, the market for weed is rife with potential, and the people in pinstripes have taken note. As the marijuana companies grow more sophisticated — and profitable — they are attracting the attention of investors and corporations.

Tapping into the green revolution, however, brings unique challenges for entrepreneurs and corporate honchos alike. States may have bucked federal law, which considers marijuana illegal for any purpose, but they have imposed their own complicated, lengthy lists of regulations meant to keep cannabis tightly under control and, in some cases, keep the corporate behemoths out.

Read more: Entrepreneurs eye emerging marijuana markets | USA Today