You can use different security lanes at the airport, if you must, but you cannot use different lanes at the border unless you are driving in two separate cars.

The DUI likely disqualifies your husband from NEXUS but shouldn’t have an affect on his entering the US as Canada tends to take drinking and driving more seriously than the US. It also depends upon which agency refused his NEXUS Card, CBSA or CBP.

If your current NEXUS card has already expired you cannot use it.

There should be an option to indicated “Retired.”

If you have been approved for a NEXUS card once your passport expires, you can update your NEXUS membership at an enrolment centre. If you get your new passport before you are approved, you should bring both your new and old passports to the interview.

You should bring everything to the interview to be safe. They may or may not ask but, if they do ask, you want to be prepared to explain everything then and there.

Bring the picture of the interview letter with you to the interview.

Just the photo ID page.

There shouldn’t be, but be sure to have an explanation ready at the interview when they ask you why.

You should take your new passport to the nearest NEXUS enrolment centre so it can be updated in your file. You do not need to make an appointment.

Yes. You can renew your NEXUS Card at the Trusted Traveller Program website.