The U.S. Supreme Court has asked for the solicitor general's opinion on requiring employers to pay for workers' medical marijuana if they're injured on the job.

Historically, insurance companies have opposed this language because it increases the number of payouts the insurer will need to make.

"This contradictory and unstable state of affairs strains basic principles of federalism and conceals traps for the unwary," Justice Clarence Thomas wrote of the conflict between state and federal marijuana laws.

Uber and Lyft have argued that Judge Ethan Schulman's injunction, issued Aug. 10, was premature, too broad and did not account for the operating practices of the two ride-hailing giants or the impacts it would have on thousands of drivers.

The order also empowered trial courts to adopt any new or amended rules intended to address the COVID-19 pandemic.