Why can’t a woman testify in court?
The halacha disqualifies various classes of people from being judges or witnesses, but these disqualifications are not all for the same reason. A person who is in a position to give testimony about a case is required to appear in court; thus if a woman’s testimony were acceptable, she could be forced to appear in court. [Similarly, a king cannot serve as either a judge or a witness.] Thus women are restricted for a constructive reason: to avoid interfering with their more important responsibilities. These disqualifications apply only to matters that require appearance in court; a woman’s testimony is perfectly acceptable in matters involving religious law (issur ve-heter). The source that disqualifies women from testifying in court is Deut.19:17, which refers to people who appear in court as “men”. The fact that a woman’s testimony is valid in religious matters that don’t involve a court is derived from Lev. 15:28, which says that a woman can count unclean days for herself.
