It does make me wonder if perhaps ABS does have a different smell than more durable polymers like Delrin or whatever a Glock is made from.
I’m sure it does, but what benefit does it do to teach a dog to distinguish between polymer types? None are exclusive enough in use to justify a search.
Powder-trained dogs are only good for areas where guns are restricted (schools, airports, etc). Dope dogs are useful because there is a presumption that an illegal substance justifies a search. A dog trained on scents of materials that are presumptively legal everywhere means no justification for search. It might be useful
during a search (like those dogs trained to sniff hidden electronics) I suppose. Like the electronics dogs, I bet they would spend 99.5% of their time hitting on inane stuff.