Tameka Foster is intent on proving that Usher is an unfit father. The singer's ex-wife filed papers in court last week that allege a number of indiscretions by Usher, most of them based on the way he has treated Tameka, not the way he has been toward his two sons. But now Foster is raising the accusatory ante, demanding a judge force Usher
to take a drug test ASAP because she believes he's been popping pills around the pair's children. Usher ...