SEATTLE -- A man was arrested Sunday after asking police if they had found his misplaced briefcase.

It was full of cocaine.

Seattle police say the 19-year-old stopped to pet someone's dog but left his briefcase behind. The dog's owner grabbed it and handed it over to an officer who was directing traffic outside CenturyLink Field Sunday.

The officer opened it in hopes of locating the owner. Inside, he found four large bags and 27 smaller bags full of cocaine -- 154 grams in all. It also contained the man's ID card, cell phone, a scale, 50 diazepam pills, and a small amount of marijuana.

Not long after that, the owner stopped back at CenturyLink and asked officers if they had found a briefcase. Police say the man claimed it had important paperwork he needed right away.

He was arrested and booked into the King County Jail for possession of narcotics with intent to distribute.