They should not be arresting people for laws that are not legal, like the War on Drugs, and should not be doing things like asset forfeiture, no-knock warrants, etc.
Exactly what law the police were enforcing was / is illegal and illegal according to WHOM?
Easy to explain.
In a democratic republic, like the US is supposed to be, then no laws can be arbitrary.
Instead they have to be necessary in order to defend the rights of others, from someone abusing them.
That makes all drug laws, no-knock warrants, etc., totally illegal, because they are not defending the rights of anyone.
They are inherently an abuse of power, and if police were not corrupt, they would be the first to complain.
That they do not, proves they are deliberately committing these offenses.
Same with prohibition, federal gun control, 3 strikes laws, etc.
They can never be legal and it should be obvious to anyone, in a democratic republic.
They violate the basic premise, which is that the only source of legal authority comes from defense of inherent individual rights.