Roughly 150 Members of the European Parliament (MEPs) are taking a urine test today and tomorrow to see if glyphosate—the cancer-linked weedkiller—is in their system.

According to The Guardian, the move comes ahead of a symbolic vote on glyphosate’s prohibition in the European Union this Wednesday.

The European Commission is proposing to grant the herbicide a new 15-year lease when it ends in June. However, in March, several EU member states, including France, Sweden, Italy and the Netherlands, led a very public rebellion over the relicensing, citing its purported health risks. The actually vote to re-approve glyphosate has now been postponed to at least mid-May.

Coupled with that, a new Yougov poll found that two-thirds of Europeans support a ban on glyphosate.

“A prohibition on the herbicide ingredient was backed by three quarters of Italians, 70 percent of Germans, 60 percent of French and 56 percent of Britons, in a survey of more than 7,000 people across the EU’s five biggest states,” The Guardian wrote.

Green Party MEP Bart Staes told The Guardian “this poll clearly shows that the European public does not want … the authorization of glyphosate, and certainly not until June 2031.”

Glyphosate has garnered a great deal of backlash in Europe ever since the World Health Organization’s International Agency for Research on Cancer (IARC) classified the ingredient as a possible carcinogen last year.

The European Green party will vote on a resolution objecting to the commission’s plans to reapprove the substance in Europe on April 13. “The finding that glyphosate is probably carcinogenic to humans by the WHO should be leading to a global moratorium on its use,” the Greens said.

A number of studies have detected glyphosate—the “most widely applied pesticide worldwide”—in our immediate surroundings and even in human bodies. A 2013 Friends of the Earth Europe study reported people in 18 European countries have traces of glyphosate in their urine.