you kinda just have to try some different brands because most poppy seeds sold in your grocery store have been washed and contain little opiates from what i hear your better of buying the larger containers of poopy seed as these have a better chance of coming unwashed. If you make tea just make sure not to use boiling water, warm water is best. If you dont have a sensitive stomache you can simply eat the seeds in yogurt or something its good nutrition and you get more drugs than just steeping in water. You know it IS poppy season drive around your neighborhood and look for some of these
Just a small tip: look for seeds that are sold in large containers & preferably not from a popular grocery store chain. They will look a little dirty & may have tiny plant pieces in it. Those are perfect.