Usher's Ex-Wife Wants Drug Test NOW! (DETAILS)

And the plot thickens!

As we reported earlier this week, R&B singer Usher is going through a nasty divorce with ex Tameka Foster. Tameka is claiming that Usher is abusing pills and requesting that he take a drug test.

Details: Tameka Foster Says Usher Is "Caught Up" On Drugs!

Our friends over at TMZ have the latest update on the situation.

Usher's ex-wife Tameka Raymond is freaking out that testing the singer for drugs will soon be useless -- because the more time that passes, the more time Usher has to cleanse his system of illicit substances.

In case you haven't been following -- Tameka demanded Usher take a drug test recently because she thinks the singer is popping pills and who-knows-what-else around their kids. 

Usher refused on grounds Tameka's demands were "frivolous and unfounded" and only intended to “harass and embarrass” the singer -- but now, Tameka is taking her case back to the judge in the ex-couple's custody war, pleading with the court to force Usher to take the test despite his refusal.

And according to the docs, Tameka wants the court to make it snappy -- claiming, any further delay will allow Usher to "cleanse" any evidence of drugs from his system.So far, no word back from Usher's reps.

We hope that the two can come to a peaceful resolution for the sake of the children. 

[Source: TMZ.com]