Study is the latest evidence that glyphosate herbicides are so pervasive that residues can be found in foods not produced by farmers using glyphosate.

As U.S. regulators continue to dance around the issue of testing foods for residues of glyphosate weed killers, government scientists in Canada have found the pesticide in 197 of 200 samples of honey they examined.

The authors of the study, all of whom work for Agri-Food Laboratories at the Alberta Ministry of Agriculture and Forestry, said the prevalence of glyphosate residues in honey samples - 98.5 percent - was higher than what was reported in several similar studies done over the last five years in other countries.

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The Canadian report, published in a journal called Food Additives & Contaminants: Part A, said that glyphosate is currently an active ingredient in 181 herbicides registered for use in Canada and its widespread use has made it commonly found in the environment.

The study authors pointed out that Canada, like the United States, does not have a legal standard for how much of the herbicide is considered safe in honey. Regulators in different countries set what are referred to as "maximum residue limits" (MRLs) and tell consumers their food is safe if pesticide residues remain below the MRLs. In Europe, the MRL for glyphosate in honey is 0.05 mg/kg, also expressed as 50 μg/kg.