For a century, the narrow canyon leading into California from Mexico provided cover for cattle thieves and opium dealers, bandits, and booze runners. More recently, it has hidden thousands of illegal immigrants on their journey north, sealing its place in border lore. Now, it's a fading memory. In 2005, the Bush administration waived state and federal environmental laws to overcome opposition..... Once a breach in the coastal hills, the gulch is now more like a dam than a passage. Anyone attempting to cross confronts a 150-foot-high berm that soon will be topped with stadium lighting, video surveillance cameras, and 15-foot-high...