You shouldn't need to eat poppy seeds or anything else, as most standard drug tests to not test for oxy in their opiate battery. The NIDA 5 standard drug screen, which is the most common pre-employmend screen used, tests for
morphine as it's opiate and this will discern use of morphine,
codeine or heroin. However, oxy is not metabolised into morphine, and as a result will not trigger a test for morphine. The poppy seeds suggested by another poster would, but these results would be different than oxy, and an advanced drug screen looking specificlly for oxy would not be fooled by poppy seeds. Find out what kind of screen you will have to pass. If It's NIDA 5 (most are) you have nothing to worry about. if it is extended, you have 2-5 days of it in your system after a single use, over a week after continued use. Look at
www.erowid.com 's drug testing vaults for more info on various drug screens, detection times and false positives.
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