Last week, the nascent marijuana industry in California scored a huge victory: The Department of Justice dropped its four-year attempt to shut down Harborside Health Center, the largest medical-marijuana dispensary in the country.

But the industry still faces “monumental challenges” to doing business, Aaron Herzberg, an attorney and a partner at California-based Calcann Holding Corporation, a medical-marijuana property and licensing company, told Business Insider.

On one hand, the DOJ’s move to drop the case against Harborside may indicate a “shift in attitude” about marijuana from the Obama administration, but “they haven’t said so directly,” Stanford Law professor Robert MacCoun told Business Insider. “Of course, we don’t really know whether policies will shift under the next president.”

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“MMRSA [took] important steps toward rationalizing many features of the whole supply chain for medical marijuana in California, and it could serve to smooth the a transition toward a legal recreational market,” MacCoun said.