
204 Money Laundering: A Guide for Criminal Investigators, Third Edition
legally possible to include trash searches in your money laun-
dering investigation, you should do so. It’s a dirty job, but it
can be very rewarding.
Pen Registers
Another good source for leads is a pen register on the subject’s
telephone. Dialed-number recorders (DNRs), or pen registers,
do not (usually) require a wiretap order. When they are placed
on the subject’s telephone line, they will provide details of the
numbers dialed for all outgoing calls. Combined with a “trap
and trace,” the pen register will cover incoming calls as well.
You don’t get any voice, but you do ...