The St. Bernard Parish Sheriff's Office is warning parents to be cautious this Halloween amid reports of colorful fentanyl pills that look like candy. “These pills could easily be mistaken for candy by a child,” said Sheriff James Pohlmann. “Ingesting just a single piece could be deadly."Pohlmann said the pills are known as “rainbow fentanyl,” and is being seized in multiple forms across the country, including pills that look similar to sweet tarts, powder, and even blocks that resemble sidewalk chalk. According to the Drug Enforcement Administration, fentanyl is a synthetic opioid that is 50 times more potent than heroin and 100 times more potent than morphine. Just two milligrams of fentanyl, which is equal to 10-15 grains of table salt, is considered a lethal dose, according to the DEA.The DEA said there is no way to know how much fentanyl is concentrated in a pill or powder just by looking at it. According to Sheriff Pohlmann said there’s also a concern that teenagers could become more interested in trying drugs laced with it because of its bright, colorful appearance. "In addition to worrying that small children may mistake rainbow fentanyl as candy or a toy like chalk, we're also very concerned teenagers may be tempted to try the drug due to its playful coloring,” Pohlmann said. Anyone who encounters fentanyl in any form is asked to not touch it and call 911. Additional resources for parents and the community can be found on DEA's website here. Pohlmann also urged parents to use caution during Halloween trick-or-treating hours and offered a list of safety tips that can be seen here.