"Manufacturers make most of the methamphetamine found in the United States in "superlabs" here or, more often, in Mexico".
According to reports, one person has been declared dead and seven other people have been hospitalised in northern Mexico after drinking meth-laced 7Up softdrink.
USA health officials in Arizona, too, have since issued a warning to any travelers to the Mexicali region, advising them to remain "vigilant" and be wary of any possible symptoms.
Mexicali is located just south of the Californian-Mexican border, around 124 miles from San Diego.
Meanwhile, Baja California health officials have said that all contaminated products have been removed from stores. Banner Health, which operates 28 hospitals in six USA states, says its toxicologists and emergency department physicians are on high alert following the reports of tampering.
Side-effects from this soft drink contamination can present suddenly and may result in life-threatening illness.
"None of the 7Up products sold in the USA are affected by the issue being reported in Mexico", Barnes said in a statement.
In July, the U.S. State Department alerted travelers to Mexico about possible tainted or counterfeit alcohol that could cause sickness and blacking out.
Dr. Daniel Brooks, director of Banner's Poison and Drug Information Center, told consumers to ensure the seals on their food and drink have not been tampered with. "We do not market, sell or distribute the brand internationally", according to Washington Post's reports.
That warning came in the wake of a Milwaukee Journal Sentinel investigation surrounding a Wisconsin woman's death that raised questions about drinks being served in all-inclusive resorts in Mexico.