Rule 607 - Who May Impeach or Support(a) Subject to the limitation imposed by these rules, the credibility of a witness may be attacked by any party, including the party calling the witness.(b) Evidence proffered by any party to support the credibility of a witness may be admitted to meet an attack on the witness' credibility.Added by SCO 364 effective 8/1/1979; amended by SCO 1153 effective 7/15/1994