Las Vegas taxicab regulators have dropped an effort to mandate installation of surveillance cameras in cabs. The Nevada Taxicab Authority has agreed to accept voluntary efforts to install the cameras. The decision follows years of wrangling with the Legislature, cab company owners, drivers and civil libertarians over the scope of a camera rule. Roughly 70 percent of valley cabs already have various types of video surveillance equipment. Holdout companies are promising to follow suit in no later than three months. Cameras aren't mandated for cabs in Washoe County.