Can the local police execute or facilitate online surveillance, or cell data surveillance, without notifying the subject in the state of Nevada?
Notification is required within 90 days of the completion of the interception order
The relevant law regarding "interception and disclosure of wire and radio communications or private conversations," NRS 179.495, provides that:
NRS 179.495 Notice to parties to intercepted communications.
1. Within a reasonable time but not later than 90 days after the termination of the period of an order or any extension thereof, the judge who issued the order shall cause to be served on the chief of the Investigation Division of the Department of Public Safety, persons named in the order and any other parties to intercepted communications, an inventory which must include notice of:
(a) The fact of the entry and a copy of the order.
(b) The fact that during the period wire, electronic or oral communications were or were not intercepted.
Note that such interception orders may last up to 30 days, but may be extended indefinitely by a court (up to 30 days at a time).