You just wanted to find out if you were Portuguese or Spanish, but instead you found out you were related to a mass murderer.

This is a reality in a world where the alleged Golden State Killer, now known as Joseph James DeAngelo, was arrested after DNA found at one of the killer's crime scenes was checked against genetic profiles from genealogical websites that collect DNA samples.

Popular genetic testing companies 23andMe and Ancestry.com are holding on to more than information about your family tree, which raises privacy conerns. Experts confirm DNA in these databases can be accessed by law enforcement and third party companies under certain circumstances, revealing intimate information about user's medical history and biological relationships.

"People don't realize that unlike most medical tests where you find out information, it isn't just about you," said Arthur Caplan, director of the Division of Medical Ethics at New York University's School of Medicine.