Interlocks are required for alcohol related driving under the influences convictions. Utah law does not require the installation of an interlock devices when the underlying conviction does not involve alcohol.
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Utah Code 41-6a-518(2)(e) states:
This section does not apply to a person convicted of a violation of Section 41-6a-502 whose violation does not involve alcohol.
Utah Code 41-6a-518.2 states:
“(b)(iii) "Interlock restricted driver" does not include a person:
(A) whose current conviction described in Subsection (1)(b)(ii)(B) is a conviction under Section 41-6a-502 that does not involve alcohol or a conviction under Section 41-6a-517 and whose prior convictions described in Subsection (1)(b)(ii)(B) are all convictions under Section 41-6a-502 that did not involve alcohol or convictions under Section 41-6a-517;
(B) whose conviction described in Subsection (1)(b)(ii)(A) or (E) is a conviction under Section 41-6a-502 that does not involve alcohol and the convicting court notifies the Driver License Division at the time of sentencing that the conviction does not involve alcohol; or
(C) *whose conviction described in Subsection (1)(b)(ii)(A), (B), or (D) is a conviction under Section 41-6a-502 that does not involve alcohol and the ignition interlock restriction is removed as described in Subsection (8). *
. . . .
(8)(a) An individual with an ignition interlock restriction may petition the division for removal of the restriction if the individual's offense did not involve alcohol.”