Public health officials in the Czech Republic are investigating 30 gay men living with HIV for the crime of exposing someone to the virus, even though the only evidence against them is that they have tested positive for a sexually transmitted infection (STI) such as gonorrhea, reports BuzzFeed.

The Prague Sanitary Office believes that contracting an STI when you’re HIV positive is proof that you are exposing someone to HIV.

“There’s absolutely no evidence, there are no victims,” Jakub Tomšej, a lawyer with the Czech AIDS Help Society, told BuzzFeed. “We believe the only consequence [of this kind of investigation] is that HIV-positive people who get another STI will simply avoid doctors.”

The men could face up to 10 years in prison.

As a result of the criminal complaints, the European AIDS Treatment Group launched a Change.org petition to “stop the persecution of people with HIV in the Czech Republic.” You can sign it here.

In related news, Radio Prague reports that the number of HIV cases in the Czech Republic for 2015 was the highest in 30 years. Data from the National Institute of Public Health showed 266 news cases of HIV last year, with 31 cases of AIDS.

In fact, last November, the Independent reports that new HIV infections hit record levels in 2015. The World Health Organization (WHO) attributes the increase to injection drug use among heterosexuals in Eastern Europe, although it adds that sex between men remains the most common mode of transmission across the continent.

“Despite all the efforts to fight HIV, this year the European Region has reached over 142,000 new HIV infections, the highest number ever,” Zsuzsanna Jakab, WHO’s regional director for Europe, told the newspaper. “This is a serious concern.”