ows: (i) no conveyance used by any person as a common carrier in the transaction of business as a common carrier shall be forfeited unless it shall appear that the owner or other person in charge of such conveyance was a consenting party or had knowledge of a violation of section 2, 3 or 4; (ii) no conveyance shall be forfeited by reason of any act or omission established by the owner of the conve