lol.. vegas... i can tell where you work.. it has little to do with qatar.. :):)
yes.. there is a rule: if you had to leave qatar AND you don't have a NOC letter from your sponsor, you cannot come and work in qatar during 2 years (so-called 2 year ban).. but if you got your NOC, you still can work no problem....

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“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry