COVID-19 May Not Cause Federal Cannabis Legalization but What About Shipping It Across a State Line?

With California deeming dispensaries as “essential services” along with the likes of drug stores, supermarkets, and gas stations, that means cannabis is considered an essential….something. Medicine?  Recreational anxiety and calming item?  If cannabis is essential like medicine, gas, pharmacy drugs, and food, could we see a scenario where a mandate is issued that cannabis can now cross a state line and be shipped by normal providers like UPS, USPS, and FedEx?