FULTON, MISS. - When Neil Brown got high on bath salts, he took his skinning knife and slit his face and stomach repeatedly. Brown survived, but authorities say others haven't been so lucky after snorting, injecting or smoking powders with such innocuous-sounding names as Ivory Snow, Red Dove and Vanilla Sky.

Law enforcement agents and poison control centers say the bath salts, with their complex chemical names, are an emerging menace in several U.S. states where authorities talk of banning their sale. Some say their effects can be as powerful as those of methamphetamine.

From the Deep South to California, emergency calls are being reported over exposure to the stimulants the powders often contain: mephedrone and methylenedioxypyrovalerone, also known as MDPV.

Sold under such names as Ivory Wave, Bliss, White Lightning and Hurricane Charlie, the chemicals can cause hallucinations, paranoia, a rapid heart rate and suicidal thoughts, authorities say. In addition to bath salts, the chemicals can be found in plant foods that are sold legally at convenience stores and on the Internet. However, they aren't necessarily being used for the purposes on the label.

Mississippi lawmakers this week began considering a proposal to ban the sale of the powders, and a similar measure is being sought in Kentucky. In Louisiana, the bath salts were outlawed by an emergency order after the state's poison center received more than 125 calls in the last three months of 2010 involving exposure to the chemicals.

In Brown's case, he said he had tried every drug from heroin to crack and was so shaken by terrifying hallucinations that he wrote to one Mississippi paper urging people to stay away from the bath salts.

"I couldn't tell you why I did it," Brown said, pointing to his scars. "The psychological effects are still there."

While Brown survived, sheriff's authorities in one Mississippi county say they believe one woman overdosed on bath salts there. In southern Louisiana, the family of a 21-year-old man says he cut his throat and ended his life with a gunshot. Authorities are investigating whether a man charged with capital murder in the December death of a Tippah County, Miss., sheriff's deputy was under the influence of the bath salts.

The stimulants are not regulated by the Drug Enforcement Administration, but are facing federal scrutiny. Law officers say some of the substances are being shipped from Europe, but origins are still unclear.

Gary Boggs, an executive assistant at the DEA, said there is a lengthy process to restrict these types of designer chemicals, including reviewing the abuse data. But it's a process that can take years.

Mark Ryan, director of Louisiana's poison control center, said he thinks state bans on the chemicals can be effective. He said calls about the salts have dropped sharply since Louisiana banned their sale in January.

Ryan said cathinone, the parent substance of the drugs, comes from a plant grown in Africa and is regulated. He said that MDPV and mephedrone are made in a lab and that they are not regulated because they are not marketed for human consumption. The stimulants affect neurotransmitters in the brain, he said.