Does this work on deer and horse flies?

I've witnessed it working on all sorts of different flies ...

Are the bags in 8pk same size as the 2 ok big bag size?

Not sure what you mean by "2 OK big bag size", but they are the same size as the singles I was buying at Home Depot and have worked just as well. Great to be able to buy them in bulk, especially during the spring/summer months.

Why can’t I have this product shipped to me in Washington State

I don’t know but each state has their own regulations on chemicals.

Does this attract bitting black flies?

Not exactly sure what a biting black fly is but these do an amazing job of attracting houseflies. I've never seen any other kind of fly in the bag. We hang ours around our horse stalls.

Brand	RESCUE!
Color	Green
Style	Fly Trap
Material	Plastic
Product Dimensions	39.2"L x 38.6"W x 56.4"H
Item Weight	2.4 ounces
Number of Pieces	8
Recommended Uses For Product	Pest Repellent
Is Electric	No
Target Species	Fly
Unit Count	8.0 Count
UPC	042853773137
Manufacturer	RESCUE!
Part Number	ORG90341111
Item model number	RESCUE! - FTD-DB12 - 8/PK
Is Discontinued By Manufacturer	No
Size	No Size
Item Package Quantity	1
Included Components	Item
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

RESCUE! Outdoor Disposable Hanging Fly Trap - 8 Traps

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