I'm going to need a better source than xitter.
Posse Comitatus is still a thing.
https://www.brennancenter.org/our-work/research-reports/posse-comitatus-act-explained
"The Posse Comitatus Act bars federal troops from participating in civilian law enforcement except when expressly authorized by law."
The only exception is the Insurrection Act:
https://www.brennancenter.org/our-work/research-reports/insurrection-act-explained
"The Insurrection Act authorizes the president to deploy military forces inside the United States to suppress rebellion or domestic violence or to enforce the law in certain situations. The statute implements Congress’s authority under the Constitution to “provide for calling forth the Militia to execute the Laws of the Union, suppress Insurrections and repel Invasions.” It is the primary exception to the Posse Comitatus Act, under which federal military forces are generally barred from participating in civilian law enforcement activities."