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Montana


Montana prohibits anyone from driving or being in actual physical control of a vehicle:
 
+ with a blood alcohol concentration (BAC) of .08% or more
+ with a delta-9-tetrahydrocannabinol (THC) level of 5 ng/ml or more, or
+ while under the influence of drugs, alcohol, or any impairing substance (or a combination thereof) to a degree that renders the person incapable of safely driving a vehicle.

 
 
  1st Offense 2nd Offense 3rd Offense
Jail
Up to 6 months (24-hour minimum)
 
Up to 1 year (5 days minimum) Up to 1 year (30 days minimum)
Fines
$600 to $1,000
 
$1,200 to $2,000 $2,500 to $5,000
License Suspension
6 months
 
1 year 1 year
Ignition Interlock Device
Period of probation
 
Period of probation Period of probation