Mary Jo White: Privacy Rules Shouldn’t Handcuff the S.E.C

I know very little about the S.E.C., but it seems odd that an agency tasked with combating "Ponzi frauds, insider trading and accounting fraud" would be unable to obtain a criminal warrant.

Are those not criminal investigations that may lead to criminal charges for those under investigation? Why then should a search warrant not be required?

Perhaps this is a quirk (or a feature) of the way the agency is intended to operate?