If your Husband is out on bond then it does not matter that the State has not indicted him yet. If he is in jail then after 90 days he is entitled to a PR Bond if the State does not indict him in that time limit. The state has until the statute of limitations is ended to Indict someone for a felony.
Mr. Stornello's answer is correct.
You are also correct that polygraphs are not admissible in court (nor can they be used for probation revocations.) However, they can be used for a variety of reasons - sometimes to help get a case dismissed even.