The sheer possibility that children may accidentally consume cannabis edibles is prompting Colorado lawmakers to intervene.

“Very young children explore their environments by putting items in their mouths, and foods such as brownies and cookies are attractive,” said Henry Spiller, a co-author of a study on child exposure to cannabis and director of the Central Ohio Poison Center at Nationwide Children’s Hospital, back in June.

The warning label will be stop-sign with the letters “THC” printed on it. The state has already banned pot manufacturers from using cartoon characters on packaging or mimicking common food packaging, but the agency has so far failed to come up with a working set of rules for the 2014 law requiring cannabis edibles to be “stamped, shaped, colored or otherwise marked” to show that it is not for consumption by children.