France thinks so
If those samples were found in the post by officials on their way to foreign laboratories, the French men who sent them could theoretically face a year in prison and a 15,000 Euro fine. This year the ban was challenged but the French Government decided to uphold and maintain the anti-paternity testing law.
The reasons for which the Government said the ban should remain were related to the preservation of peace within French families. According to some online articles, Germany, has also banned (or plans to ban) paternity testing for similar reasons. French psychologists suggest that fatherhood is determined by society not by biology.