Arizona Gov. Jan Brewer signed into law Wednesday another ban on synthetic marijuana, touting it as a new tool for law enforcement officials struggling to go after the evolving chemical configurations that make up synthetic drugs.

Compounds used to make so-called bath salts, synthetic stimulants currently sold by some smoke shops and convenience stores, would be illegal under legislation endorsed Wednesday by a state Senate committee.

Those on the frontlines know them as one of the most dangerous drugs, and one of the most misleading terms. Bath salts: they are no day at the spa. They are a new synthetic drug, destroying lives and ripping apart families across the country.

The Arizona Supreme Court refused Monday to block an execution scheduled for Tuesday, turning away a constitutional challenge that included a claim by defense lawyers that more than one sedative was improperly used in a previous execution.

A man who raped and killed a 13-year-old Tempe girl in 1984, then took part in her search and attended her funeral was executed by lethal injection Wednesday with a drug that has never been used before in the state.

The Arizona Supreme Court has halted the planned execution of inmate Donald Beaty, who was scheduled to be given a lethal injection Wednesday morning for the rape and murder of a 13-year-old Tempe girl in 1984.

A man convicted of killing two people in a 1989 Phoenix convenience store robbery was executed Tuesday despite last-minute arguments by his attorneys who raised questions over one of the lethal injection drugs and said there was "substantial doubt" about his guilt.

The U.S. Supreme Court Tuesday declined to stop the execution of an Arizona death-row inmate hours before he was set to die by lethal injection for killing two people in a 1989 convenience store robbery.

Spice, a chemically treated blend of herbs marketed as incense but often smoked as an alternative to marijuana, is now illegal in Arizona.

Spice, an herb often smoked as a legal alternative to marijuana, should be banned in Arizona because of its dangerous side effects, a state lawmaker said Thursday.