Along the banks of the Rio Grande in the scrubby grassland near Penitas, Texas, hundreds of colored plastic wristbands ripped off by migrants litter the ground, signs of what U.S. border officials say is a growing trend among powerful drug cartels and smugglers to track people paying to cross illegally into the United States.
The plastic bands - red, blue, green, white - some labeled "arrivals" or "entries" in Spanish, are discarded after migrants cross the river on makeshift rafts, according to a Reuters witness. Their use has not been widely reported before.
Some migrants are . . .
