If one violation occurs at any time after the device is installed does this result in a six month extension?

Each reported violation that is validated by the manufacturer results in a six month extension.  A.R.S. §28-1461.E. prescribes the department shall extend an ignition interlock restricted or limited driver license and the certified ignition interlock device period for six months if the department has reasonable grounds to believe that any of the following applies:

How does a Manufacturer or an IISP determine if a person named in the application has a conviction in a foreign country?

The applicants are not limited to the owners of the ignition interlock service provider; all applicants provided to the department are included.  There are several agencies that conduct background checks.  These agencies may be found by searching the internet for businesses and locations of your choice.

Will it be necessary for service center owners to still be certified even if they are not actually installing an interlock?

All applicants participating in any ignition interlock activities must be certified.  If the owner of the location is not participating in any ignition interlock activities, they don’t need to be a certified technician but still need to sign the service center application to verify the interlock services at that center.

An ignition interlock service center will be required in every county. If a service center decertifies, how long will a manufacturer have to replace that location?

According to A.A.C. R17-5-618 (D) An IISP shall facilitate the immediate replacement of the IISP’s service center if the service center goes out of business or the service center is closed, and the IISP does not have a service center in the county.