Am I civilly or criminally liable for my spouse if he gets a DUI or harms someone when he drinks and drives?
You would not be criminally liable for your spouse. He would carry that burden all by himself.
"Alaska DWI arrests trigger two separate cases, and each of these cases must be defended following a drunk driving arrest. First, there is the court case, which can result in punishment that includes jail time, fines, mandatory DWI educational programs, ignition interlock devices, and more. Additionally, every driver arrested for Alaska DWI that submits to a chemical test of .08% or more, or who refuses to take a chemical test following their arrest for Alaska DWI, DUI, or any drinking and driving charge, will be subject to a Division of Motor Vehicles (DMV) case where their license may be taken away.
Alaska DWI cases can be prosecuted on one of two theories: either violation of Alaska’s "per se" law by driving with a blood or breath alcohol content of .08% or higher, or by driving while impaired. Impairment, for purposes of Alaska’s drunk driving laws, can be proved by driving patterns, field sobriety test performance, and chemical test results.
Alaska DWI convictions are generally misdemeanors (although may be treated as a felony if it is a third-offense or greater, or involves bodily injury). Punishment for Alaska DWI (or for related Alaska drunk driving convictions) includes fines, jail time, and community service. Electronic monitoring may be obtained in lieu of jail time in appropriate cases."
As for civil liability, if you are sued then all assets that are jointly held could be in jeopardy if your insurance coverage is insufficient to cover a judgement rendered against you based upon the injuries alleged. See if you can get your spouse in to a program to help end the drinking and driving. Good luck.