Drooling onto the pillow in your bed in your sleep instead of going to work? Now that saliva can be put to use. Reuters spills the beans about a new spit test for bipolar disorder:

The $399 kit uses a saliva sample to test for one of the likely dozens of genes associated with bipolar disorder, GRK3; the results and a report are mailed to your physician. The company's website states that if you have the gene, you are two to three times more likely to have the disorder, depending on the particular gene variation found.

But the test cannot give a definitive diagnosis or predict future risk of developing the disorder, and a negative test does not rule out bipolar disorder. As well, the test results are only valid for Caucasians with Northern European ancestry who have at least one relative with bipolar disorder, and who are exhibiting symptoms of the disease themselves.

So, as my Jewish relatives would say: What could be wrong? A LOT.

What it boils down to is that the information provided by the existing tests don't add or subtract anything of value, [Harvard Medical Letter editor Michael C.] Miller said. They just provide a result that may confuse more than it clarifies.

"Sometimes a little knowledge is a bad thing," he said, "especially if you don't know how to interpret it."

There is also the issue of privacy. On Thursday, Congress passed a bill that protects individuals against discrimination based on genetics. But putting your genes -- especially as related to psychiatric health -- on record, could still come back to haunt you later, warned Miller, adding that mental health is still poorly understood, which allows a person's psychiatric history to be manipulated.