Breath Alcohol

Iowa Department of Public Safety Division of Criminal Investigation

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Statistics for Shelby County

Previous Six Months

Month	Year	Average Alcohol Level (g/210L)	Number of Tests
November	2024	0.115	3
October	2024	0.074	3
September	2024	0.134	3
August	2024	0.137	4
July	2024	0.113	5
June	2024	0.147	5
		Total:	23

Year to Date

Year	Average Alcohol Level (g/210L)	Number of Tests
2024	0.131	44
2023	0.140	44
2022	0.134	42
2021	0.126	45
2020	0.137	55
2019	0.145	44
2018	0.143	52
2017	0.122	32
2016	0.149	38
2015	0.169	35
2014	0.117	30
2013	0.159	34
2012	0.164	47
2011	0.121	37
2010	0.117	33

DataMaster CDM Historical Data *

Year	Average Alcohol Level (g/210L)	Number of Tests
2010	0.116	27
2009	0.142	52
2008	0.138	73
2007	0.122	61
2006	0.113	78
2005	0.129	40
2004	0.142	51
2003	0.118	51
2002	0.152	17
	Total:	450

* The DataMaster CDM in use in Iowa from 1999 until 2011 was capable of limited data collection. This section of the website allows users to view the approximate number of tests and the average alcohol concentration of the subject for each county from 2002–2010.

This data is limited to the DataMaster CDM only. Please note, that the data may not be complete. The DataMaster CDM was capable of only holding approximately 175 tests at a time and there were situations that the memory was full and would no longer store tests until it was downloaded. Also, data may have been lost, never stored or cleared from memory prior to a download taking place.

The statistical data includes several subject tests that may have been performed by officers as "practice" and suspects that may have been impaired by substances other than alcohol therefore resulting in a zero breath alcohol result. Eliminating any test that was below 0.010 g/210 L, the statewide average over the past decade has been around 0.147 g/210 L.

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