In California, which has had a safe haven statute since 2001, officials are about to unveil the second phase of a $1.7-million drive to publicize the law. In Los Angeles County, all county vehicles will soon bear bumper stickers that read, "Don't Abandon Your Baby." But as these efforts are launched, a number of experts are questioning whether the safe haven concept works."We're having more babies abandoned than ever before," said Debbe Magnusen, founder of Costa Mesa-based Project Cuddle, which runs a 24-hour hotline for women who are hiding pregnancies or contemplating abandoning babies.