Perhaps you are referring to the State law against Coercion?
"RCW 9A.36.070
Coercion.
(1) A person is guilty of coercion if by use of a threat he compels or induces a person to engage in conduct which the latter has a legal right to abstain from, or to abstain from conduct which he has a legal right to engage in.
(2) "Threat" as used in this section means:
(a) To communicate, directly or indirectly, the intent immediately to use force against any person who is present at the time; or
(b) Threats as defined in *RCW 9A.04.110(25) (a), (b), or (c).
(3) Coercion is a gross misdemeanor.
[1975 1st ex.s. c 260 § 9A.36.070.]
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The Threats are: (27) "Threat" means to communicate, directly or indirectly the intent:
(a) To cause bodily injury in the future to the person threatened or to any other person; or
(b) To cause physical damage to the property of a person other than the actor; or
(c) To subject the person threatened or any other person to physical confinement or restraint; or
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Please note that the reference to threats under (25) are now under (27) due to subsequent amendments to the law.
"
(d) might well apply in the case of an officer:
"(d) To accuse any person of a crime or cause criminal charges to be instituted against any person; or
A gross misdemeanor criminal conviction carries a maximum penalty of 365 days in jail and a $5,000.00 fine.
Now all one has to do is get someone to prosecute.