In a letter to Path Intelligence CEO Sharon Biggar, Schumer urged the company to obtain the explicit consent of shoppers' through an opt-in policy.

WSJ: Schumer: Don't track shoppers without consent

This letter constitutes the report and notifications required by section 272 of Public Law 109-401 and the resolution of advice and consent to ratification of the United States Senate of March 31, 2004.

WHITEHOUSE: The White House