Kodak Black Arrested on Weapons & Drugs Charges at U.S. Border ... Not 'Missing' After All

EXCLUSIVE

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image5:24 AM PT -- Cops say Kodak and 2 others attempted to enter the U.S. at the Lewiston-Queenston International Bridge in a Cadillac Escalade with a temporary California registration. They say Kodak was the driver, and officers discovered weed on him ... after further inspection of the vehicle they also found a Glock 9mm pistol which was undeclared by anyone in the Escalade.

There was also a Porsche traveling with Kodak's team with 3 other individuals. The driver of the Porsche copped to having 2 loaded handguns and a third was found in the trunk ... aaaand more marijuana.

Stetson President and Madarrow Smith were both arrested for criminal possession of a weapon ... Jeantony Saintmelus -- who was driving the Porsche -- was booked for criminal possession of a weapon and possession of marijuana.

While Kodak never made it to his show in Boston ... his tour bus did, and angry fans surrounded it after getting word he was a no-show. 

4/18 3:27 AM PT -- It's now very clear why Kodak Black canceled his show in Boston ... the rapper was arrested on weapons and drugs charges at the U.S. Border. Law enforcement sources tell TMZ, Kodak and 3 other people were stopped by U.S. Customs Agents Wednesday. We're told Kodak was arrested for criminal possession of a weapon -- a  felony -- and a misdemeanor possession of marijuana charge.

Multiple sources familiar with the arrest tell us Kodak was traveling with at least two guns ... and stopped when entering the U.S.

Read more from our friends at TMZ