Police said Thursday it could be weeks before a decision is made on whether to file charges.

"We'll do an analysis and see what it is. There's no sense of urgency to it," Detective Alvaro Zabaleta said Thursday.

The bottle was found to have a compartment that contained "a small amount of dark particulate and a pungent aroma closely associated with marijuana," the police report said. The compartment was hidden by the bottle's label so that it appeared to be a full bottle of water when held upright, police said.

Vick entered an airport concourse Wednesday morning with the 20-ounce bottle. His initial reluctance to turn over the bottle aroused suspicion among airport security screeners, a police report said. He eventually handed it over and boarded his flight to Atlanta.

Police said the bottle was sent to the Miami-Dade County crime lab.

Vick did not immediately return a phone call early Thursday.

"We plan to look into the matter and discuss it with Michael Vick before having any further comment," Falcons spokesman Reggie Roberts said.

Under Florida law, possession of less than 20 grams of marijuana is a misdemeanor punishable by up to a year in prison and a $1,000 fine. First offenders rarely do any jail time.

Two Transportation Security Administration screeners recognized the 6-foot, 215-pound Vick.