Delaware has officially decriminalized possession by adults of small amounts of marijuana.

A decriminalization law signed in June by Gov. Jack Markell took effect early Friday morning.

The law makes possession by an adult of a "personal use" quantity of marijuana, defined as an ounce or less, a civil offense punishable by a fine of $100. Simple possession remains a criminal offense for anyone under 18. For those between the ages of 18 and 21, a first offense will result in a civil penalty, but any subsequent offense would be a misdemeanor.

Smoking pot in a moving vehicle, in public areas, or outdoors on private property within 10 feet of a street, sidewalk or other area accessible to the public also would be a misdemeanor.