(a) A witness or a person believing he will be called as a witness in any official proceeding commits the crime of bribe receiving by a witness if he solicits, accepts or agrees to accept any thing of value upon an agreement or understanding that:
(1) His testimony will thereby be corruptly influenced;
(2) He will attempt to avoid legal process summoning him to testify; or
(3) He will attempt to absent himself from an official proceeding to which he has been legally summoned.
(b) This section does not apply to the payment of additional compensation to an expert witness over and above the amount otherwise prescribed by law to be paid to a witness.
(c) Bribe receiving by a witness is a Class C felony.