Texas Government Code - GOV'T § 62.411. Justice Court Rules

(a) In addition to other methods of jury selection provided by this chapter, a justice of the peace may issue a writ commanding the clerk, sheriff, or constable to immediately summon a venire from which six qualified persons may be selected for jury service if:

(b) Jurors who are empaneled shall remain in attendance in the court and, until discharged by the court, may serve as jurors in any case before the court.

(c) This section applies only in a county with a population of more than 2.8 million.