Hello brother, one of my friend who worked in...

Hello brother, one of my friend who worked in Qatar and had a case for drugs. He didnt attended any courts hearing or anything. He had been in deportation center for one week and he was deported from Qatar in Dec 2020. Then he came to UAE and got a new job and got his ID as well. When he went on vacation few weeks back he had been stopped by UAE immigration and they have informed as he had a case in Qatar, he cannot come back to UAE. Is this usual when he had been deported from a GCC country and he cannot enter any other GCC countries for work??If so is there any solution that he can be back in UAE. Looking forward for your advice on this.