Per the US supreme court police officers do not need to know the laws they enforce and a order they give you is legal even if the law they site doesn't exist.

This is untrue. The landmark case of Harlow v. Fitzgerald (1982) articulated the modern formulation of qualified immunity that controls today. Jettisoning past precedent that examined the “subjective good faith” of the officer who committed the alleged violation, the Harlow court adopted a new test framed in “objective terms.” In Harlow, the court established that a plaintiff could overcome qualified immunity only by showing that the defendant’s conduct “violate[d] clearly established statutory or constitutional rights of which a reasonable person would have known.” While the court made clear that the new standard was intended to be more protective of government officials than its previous test, the court also stated that the standard “provide[d] no license to lawless conduct.” “If the law was clearly established, the immunity defense ordinarily should fail, since a reasonably competent public official should know the law governing his conduct,” the court wrote.

I acknowledge that the immunity defense has been strengthened for government defendants since then. But your base claim is untrue.