Let's look at the HISTORICAL record - 1932 to be precise.
There was a Bonus Army of some 34,000 (17,000 were WW1 vets)encamped at Hooverville on the Anacostia Flats, a swampy, muddy area across the Anacostia River from the federal core of Washington.
On July 28, U.S. Attorney General William D. Mitchell ordered the veterans removed from all government property. When the police attempted to execute this order they were met with resistance and 2 vets were killed. President Herbert Hoover then ordered the army to clear the veterans’ campsite.
Elements of the 12th Infantry Regiment and the 3rd Cavalry Regiment, supported by six battle tanks were deployed to carry out the Presidential order. Through the use of cavalry charges, bayonets and adamsite gas, an arsenical vomiting agent, Hooterville was cleared of its inhabitents (men, women, and children) and burned.
In the Presidential elections that fall, some 4 months later, Hoover's bid for reelection failed.
The USA Chief of Staff, Douglas MacArthur didn't retire until 1937, but was recalled to active duty in 1941 and remained on active duty for 10 more years and Maj George Patton, the tank commander, continued on active duty until his death in 1945.
Based on the history of 1932 and the current administration I wouldn't depend on the Posse Comitatus Act of 1878 to do anything to prevent, reduce, or slow down the use of the US military, in full combat array, to maintain “the public order”.
Drones are operated by the military. You have to be a “pilot” to “fly” one. I’ve said before and I’ll say it again, some fat deputy sheriff sitting behind a desk is not flying these things spying on Americans.