clipped from www.nytimes.com

Tanveer Ahmad, it turns out, was a longtime New York City cabdriver who had paid thousands of dollars in taxes and immigration application fees. Whether out of love, loneliness or the quest for a green card, he had twice married American women after entering the country on a visitor’s visa in 1993. His only trouble with the law was a $200 fine for disorderly conduct in 1997: While working at a Houston gas station, he had displayed the business’s unlicensed gun to stop a robbery.

When the 43-year-old man died in a New Jersey immigration jail in 2005, the very fact seemed to fall into a black hole. Although a fellow inmate scrawled a note telling immigrant advocates that the detainee’s symptoms of a heart attack had long gone unheeded, government officials would not even confirm that the dead man had existed.