OMB NDTS 2010 REVISED Supporting Statement PART B

SUPPORTING STATEMENT
National Drug Intelligence Center Drug Threat Assessment Survey
OMB No. 1105-0071

B. COLLECTION OF INFORMATION EMPLOYING STATISTICAL
METHODS
1. The potential respondent universe is the 7,907 municipal police departments and
county sheriff departments (in states where sheriffs have drug enforcement
responsibilities) with 10 or more full-time equivalent sworn officers identified in the
2000 Census of State and Local Law Enforcement Agencies conducted by the United
States Department of Justice Bureau of Justice Statistics. The existing sample of
3,465 agencies was drawn to ensure that the sample is representative at the state level.
Please see the attached table for a breakdown of the sample by stratum. The response
rate for 2010 was 85.5 percent. A response rate of 88.5 percent was achieved in 2009
with a similar collection form. A breakdown of the of the sample plan is attached.
2. The sample was a systematic sample by stratum (state) with a random start within
each stratum. Law enforcement agencies with 75 or more full-time equivalent sworn
officers and state drug enforcement agencies were sampled with certainty. Local law
enforcement agencies with 10 or more and less than 75 full-time equivalent sworn
officers were selected randomly within each state stratum. The degree of accuracy
should be a 3% coefficient of variation on sworn full-time equivalent sworn officers
(size of agency).
3. NDIC Field Program Specialists located throughout the United States will be
assigned to identify and verify appropriate survey recipients at sample agencies and
conduct follow-up activities for non-responding agencies. A weighting adjustment
will be made to correct for agency nonresponse. The sample size will comprise 44
percent of the respondent universe.
4. No tests of procedures will be conducted.
5. Carma Hogue (301-763-4882) and Suzanne Dorinski (301-763-4869) of the U.S.
Census Bureau were consulted on statistical aspects of the design. The U.S. Census
Bureau will not actually collect and/or analyze the information for NDIC.

Stratum
Alabama
Alaska
Arizona
Arkansas
Colorado
Connecticut
Delaware
Florida
Georgia
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Southern California
Rest of California
Certainties due to size
State agency certainties
Certainty agencies outside US
TOTAL

Number of Agencies

Sample Agencies

154
16
54
105
89
73
12
186
243
50
375
171
104
91
125
109
80
41
230
247
154
124
220
32
45
18
67
363
49
263
232
21
424
122
77
359
26
103
16
168
414
60
31
59
119
49
197
28
58
166
1,206
66
3

54
16
28
54
22
23
12
37
49
50
76
55
58
46
64
22
64
29
53
50
63
73
64
32
45
18
56
73
36
52
51
21
85
51
31
72
26
34
16
43
83
39
31
24
42
43
52
28
11
33
1,206
66
3

7,897

3,465