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Definitely available in the states.

I had to do a USA federally mandated drug test for a license once and one of the questions they ask before administering is if you have had poppy seeds recently.

These exist, although pretty rare these days to come across them in my experience.

You can still get the filling by the can in most grocery stores. Nothing like a warm poppy seed kolache...

Those strudels are widely available in the USA, at least in major cities and upscale grocery stores. Yes, consuming them will trigger a drug test.

You can get yummy puppy seed cake rolls from any Polish bakery. The international fresh market nearby when I used to live got them from Polish bakeries on Milwaukee Ave in Chicago. My dad used to make a really good poppy seed coffee cake, too.