Pennsylvaia Gov. Tom Wolf signed a bill Friday amending the Pennsylvania medical marijuana law so that the state’s  research program can proceed.

The bill, HB 2477, was necessary to circumvent a lawsuit challenging the constitutionality of a section of the marijuana law referred to as Chapter 20, writes Sam Wood at philly.com.

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That provision allows medical schools to work with marijuana companies that will generate data for pharmacological research. Opponents said the law improperly delegated the state’s authority to the schools and allowed the companies to avoid the rigorous selection process under which existing commercial cannabis growers and dispensaries had been subjected.

The rewritten law also does not specify what constitutes research or call for disclosure about possible payments made from the companies to the medical schools. Critics said the lack of disclosure risked the possibility of pay-to-play.

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