DUI DWI DRE: Impaired Driving Lawyer

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BAC Instruments and SAS in Ontario

Intoxilyzer® 5000C

Manufactured by: CMI, Inc.

Used by: Peel Regional Police Service, Toronto Police Service, Ontario Provincial Police (O.P.P.), Royal Canadian Mounted Police (R.C.M.P.), Halton Regional Police Service, York Regional Police Service, Durham Regional Police Service

External Link to Manufacturer

External Link to Local Distributor

The Naked Intoxilyzer® 5000C

This instrument includes a mouth alcohol detection algorithm to flag "INVALID SAMPLE" when mouth alcohol is detected. This system works with some physiological presentations of mouth alcohol but not all. Individuals with a true BAC of 50 mg/100mls could blow in excess of 150 mg/100mls without triggering the mouth alcohol detection system. Here is a YouTube video example of a subject with true BAC of 116 to 120 mgs/100mls who blows 303 mg/100mls as a result of mouth alcohol effect followed by another video demonstrating the limitations of this mouth alcohol detection system.

Some Intoxilyzer® 5000 64 Series (the 5000C), 66 Series, and EN series instruments may be affected by radio frequency interference (RFI) from cell phones, police radios, and other electronic equipment in and around the breath room. Sometimes in such cases the instrument may flag "RFI- Inhibit". The difficulty is that sometimes the RFI detection system is not adequate to catch RFI interference. The RFI flag does not work with all RFI environmental conditions. The following are YouTube video examples where RFI from a cell phone receiving a text message interferes with the reliability of the instrument. A further video explains the effect. More videos can be found on YouTube.

It should be noted that not all RFI will affect Intoxilyzer® 5000 results. Some RFI will, depending upon frequency of the transmission, antenna position, strength of signal, and proximity of the device. Unfortunately, serious scientific study of the phenomenon is lacking. Since RFI does affect some functions of evidentiary breath testing instruments, their reliability cannot be assumed if police officers are not maintaining a radio-free and cell-phone free zone in and around the breath room. Serious additional study is warranted. Governments and manufacturers need to be more transparent about the issue and permit access by defence experts to new representative instruments for independent study.


Please see www.impaired-driving.com for more recent information on approved instruments and accessory equipment used in Ontario, Canada.

Warning: This is NOT a government web site.  

Technical Discussion    Edit

Case Brief - R. v. Stinchcombe    Edit

Alcohol Test Committee Standards    Edit

Idaho Intoxilyzer 5000 Training Manual    Edit

Virginia Intoxilyzer 5000 Training Manual    Edit

Ontario Intoxilyzer Training Manual    Edit

US Patent Information PN 5,422,485    Edit

US Patent Information PN 3,792.272 (You'll need to click "Full Text" then "Images"-use Quicktime)    Edit

US Patent Information PN 4,587,427 (See above)    Edit

"Intoxilyzer Breath Alcohol Testing - Professional Edition" by Jan Semenoff    Edit

Alcohol Test Committee Standards Revised 2003    Edit

Infrared Breath Instrument Explanation    Edit







This site is designed to encourage fair professional discussion among police officers,  lawyers, toxicologists, and judges respecting the appropriate use of these instruments. Please report any inappropriate or unfair comments forthwith to biss@lawyers.ca.
Intoxilyzer®  is a registered trademark of CMI, Inc. The Intoxilyzer® 5000C is an "approved instrument" in Canada.
Breathalyzer® is a registered trademark of Draeger Safety, Inc., Breathalyzer Division. The owner of the trademark is Robert F. Borkenstein and Draeger Safety, Inc. has leased the exclusive rights of use from him. The Breathalyzer® 900 and Breathalyzer® 900A are "approved instruments" in Canada.
Alcotest® is a registered trademark of Draeger Safety, Inc. The Alcotest® 7410 GLC is an "approved screening device" in Canada.


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  WARNING: All information contained herein is provided for the purpose of providing basic information only and should not be construed as formal legal advice. The authors disclaim any and all liability resulting from reliance upon such information. You are strongly encouraged to seek professional legal advice before relying upon any of the information contained herein. Legal advice should be sought directly from a properly retained lawyer or attorney.

Warning: This is NOT a government web site.