Non-custodial Parent Should Not Claim Dependency Exemption Without Proper Form

If you are a non-custodial parent claiming one of your kids as a dependent, do you have Form 8332 (Release of Claim to Exemption) signed by the custodial parent and attached to your return?  If you don't, as far as the IRS is concerned, you don't have a right to the exemption.  You might find this extremely frustrating because you have an order from a probate court signed by a judge that says you are entitled to the exemption.  Unless that order also has the custodial parent's signature and ...