Evidence that possesses probative value commonly accepted by reasonable and prudent individuals in the conduct of the individuals' affairs may be admitted at a hearing. Incompetent, irrelevant, immaterial, and unduly repetitious evidence may be excluded. The presiding officer is not bound by technical rules of evidence. Written statements may be submitted by parties before and at the hearing and for such period of time that the presiding officer may designate the record to remain open after the hearing.