Howman also questioned whether life bans were the solution to cycling's doping problems, saying that offering amnesty to riders who come forward with information would help the sport clean itself up.
"This is a very good opportunity for the page to be turned, once it has been fully written," he said. "I don't think it will be fully written unless all the stuff comes out, and to get all the stuff out there has to be consideration of some form of amnesty or forgiveness to those who have all the information."
AP Sports Writer Graham Dunbar in Geneva contributed to this report.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.