the u.s. has now made its way into our orange juice. the fda is stepping up testing, but it is not pulling the juices from the shelves. more on all this now from abc's lisa stark. >> reporter: it all began with a confidential call to the fda. an orange juice company, the government won't say which one, said it found something in its juice and that of a competitor that should not be there, a pesticide used to kill fungus in the orange groves. the chemical, called carbepdazim, is not approved for use on citrus in the u.s., but it is used around the world. >> not all of the orange juice that u.s. consumers drink comes from oranges that were grown here in the united states. and just because a chemical's illegal here doesn't mean other countries don't allow it to be used. >> reporter: the juice with the chemical in it was imported from