It reads, in full:
In addition to the grounds for issuing a warrant in section 3103 of this title, a warrant may be issued to search for and seize any property that constitutes evidence of criminal offense in violation of the laws of the United States.
(Added Pub.L 90-351, Title IX S 1401(a), June 19, 1968, 82 Stat. 238.)
The 2001 Amendment added section (b) on Delay ("any notice may required be delayed if": there's an adverse effect, the warrant prohibits seizure, AND the warrant provides for such notice which the court may extend)
That's pretty broad in itself, prior to the PATRIOT Act.
Thanks!