The search results provide information about the use of bath salts as a drug and its possible link to a violent incident in Miami. Here are some details about bath salts:

Positive:

• Bath salts are not a hygiene product used for bathing, as the name might imply, but are dangerous synthetic ("man-made") cathinones.
• They are often sold on the street as cheap substitutes for other stimulants such as methamphetamine and cocaine.

Negative:

• Bath salts can lead to serious, and even fatal adverse reactions. The drug effect is a high or "rush" that is similar to methamphetamine (speed) .
• Users are often hyper-agitated, hot and sweating, and their heart rate is dangerously high, their blood pressure is up, and seizures are common.
• The drug has been linked to other crimes in which the suspect becomes irrational and violent.

Ingredients or materials:

• The most commonly reported ingredient is methylenedioxypyrovalerone (MDPV), although other stimulants may be present, such as mephedrone.
• Mephedrone is a synthetic cathinone.

It is important to note that bath salts are illegal and highly dangerous. The use of bath salts can lead to serious health problems and even death.