Metro to Randomly Search Riders' Bags By Lena H. Sun Washington Post Staff Writer Tuesday, October 28, 2008; Page A01 Metro officials yesterday announced plans to immediately begin random searches of backpacks, purses and other bags in a move they say will protect riders and also guard their privacy and minimize delays. The program is modeled after one begun three years ago in New York that has withstood legal challenges. However, experts said it is difficult to measure the effectiveness of such searches, beyond assuring the public that police are being vigilant. New York officials declined to say what they...