I was searching for when NEXUS centers would reopen, when the whole passport debacle started, to see if we could renew ours earlier. I read an article that said US officers were armed before the pandemic, and this was a subject of disagreement between the two countries.
"U.S. preclearance officers can be armed in Canada in the same operational environment as Canada Border Services Agency (CBSA) officers (reciprocity). U.S. officers are not currently armed in Canada, pending the installation of appropriate storage facilities in preclearance airports."