Pen Registers and Trap and Trace Devices 1987-1998

Approvals for Federal Pen Registers and Trap and Trace Devices 1987-1998

Year	Pen Registers*	Extensions	Trap and Trace**	Extensions
1987	1682	1217	91	6
1988	1978	1736	213	31
1989	2384	1999	308	105
1990	2353	2445	475	81
1991	2445	2425	577	138
1992	3145	2876	972	219
1993	3423	3299	2153	3777
1994	3696	3409	1311	1146
1995	3414	3200	1558	1419
1996	3262	2854	1317	1338
1997	4369	4266	1409	1390
1998	4886	4621	2437	2770

(Source: US Justice Department annual reports to Congress)

* A pen register is an electronic device which records all numbers dialed from a particular phone line.

** A trap and trace device records the originating phone numbers of all incoming calls on a particular phone line.

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