I think the quarantine was a directive of the Health Dept and that may have
come via the Dallas County health dept. which may fall under the jurisdiction
of the Dallas Commissioners Court. I don’t think any court of law issued the
quarantine. JMO as I’ve not read a lot of the info.
IIRC, there was a quarantine first, which was violated by the family, then there was a court order and armed guard. Of course, what the news reports and the language used sometimes doesn’t convey happenings as exactly as it should.