Like dungeon doors that swing both ways, polygraph tests can be tickets to jail or passports to freedom. Trouble is, under current New Jersey law you have to agree to their admissibility in evidence before you know the outcome — a tough choice to make without a lawyer.

That’s why defense attorneys hope the New Jersey Supreme Court is poised to topple a 1989 appellate case that says polygraph results are admissible if the suspect waives the right to challenge them, even if unrepresented at the time.