Law enforcement sources tell TMZ, Serena's assistant called 911 around 6AM last Wednesday, reporting a possible burglar or prowler. It was so serious, we're told Serena retreated to her panic room for safe keeping in case things got dangerous.
But we're told, it was a false alarm -- the person on Serena's security camera was a random drug tester for an unspecified tennis association, stopping by Serena's pad unannounced.
Police came but realized the mistake. TMZ didn't know whether Serena eventually submitted to the test.
There are plenty of holes in this story (why did they think the drug tester was an intruder; did he/she scale a fence or wait politely at the gate?), but we'll let those go for now. Given Serena's previous run-in with a stalker, being overly cautious is always the right move.
As for the fact that it was an eventual drug tester, surely there are some better methods to collection. Drug testing is only effective if it's unannounced, but you'd think they could at least give a five-minute "we're on the way" heads up. Though I'm not exactly up on drug test masking agents, I doubt that little window of time would be enough to clean something out of your system. Maybe to make up a ridiculous alibi that authorities believed, perhaps, but not to get clean.