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You are right, they are guilty of being anti vax. If you would read the link provided in the article I sent you by the Washington State Legislator you will see much more than it is for out of state. Read closely, it is not a conspiracy.
WAC 246-100-040 Procedures for isolation or quarantine.
(1) At his or her sole discretion, a local health officer may issue an emergency detention order causing a person or group of persons to be immediately detained for purposes of isolation or quarantine in accordance with subsection (3) of this section, or may petition the superior court ex parte for an order to take the person or group of persons into involuntary detention for purposes of isolation or quarantine in accordance with subsection (4) of this section, provided that he or she:
(a) Has first made reasonable efforts, which shall be documented, to obtain voluntary compliance with requests for medical examination, testing, treatment, counseling, vaccination, decontamination of persons or animals, isolation, quarantine, and inspection and closure of facilities, or has determined in his or her professional judgment that seeking voluntary compliance would create a risk of serious harm; and
(b) Has reason to believe that the person or group of persons is, or is suspected to be, infected with, exposed to, or contaminated with a communicable disease or chemical, biological, or radiological agent that could spread to or contaminate others if remedial action is not taken; and
(c) Has reason to believe that the person or group of persons would pose a serious and imminent risk to the health and safety of others if not detained for purposes of isolation or quarantine.
(2) A local health officer may invoke the powers of police officers, sheriffs, constables, and all other officers and employees of any political subdivisions within the jurisdiction of the health department to enforce immediately orders given to effectuate the purposes of this section in accordance with the provisions of RCW 43.20.050(4) and 70.05.120.
(3) If a local health officer orders the immediate involuntary detention of a person or group of persons for purposes of isolation or quarantine:
(a) The emergency detention order shall be for a period not to exceed ten days.
(b) The local health officer shall issue a written emergency detention order as soon as reasonably possible and in all cases within twelve hours of detention that shall specify the following:
(i) The identity of all persons or groups subject to isolation or quarantine;
(ii) The premises subject to isolation or quarantine; (iii) The date and time at which isolation or quarantine commences;
(iv) The suspected communicable disease or infectious agent if known;
(v) The measures taken by the local health officer to seek voluntary compliance or the basis on which the local health officer determined that seeking voluntary compliance would create a risk of serious harm; and
(vi) The medical basis on which isolation or quarantine is justified.
(c) The local health officer shall provide copies of the written emergency detention order to the person or group of persons detained or, if the order applies to a group and it is impractical to provide individual copies, post copies in a conspicuous place in the premises where isolation or quarantine has been imposed.
(d) Along with the written order, and by the same means of distribution, the local health officer shall provide the person or group of persons detained with the following written notice.
this is only a part of it.