The police agencies get a huge amount of federal cash. They’ve built it into their budgets. If they don’t follow the rules they don’t get the cash. The effects will vary by agency but most will follow whatever the feds say.
This post needs to be shouted from the mountain tops!
But I add to that..”federal funding will affect the SOP. The officers themselves will follow all edict because they have been setup to trust and need their pensions.. making too little money for a change to a new career and too much to be willing to simply stop working in that field.
The pension is what keeps corrupt Ellie’s in control even down to your living room.
Even in terms of state influence on the police, they will always follow whatever order is given.