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My bodybuilding friend travels within Europe with protein and creatine powder in his carry-on and has never had issues. Drugs are usually detected by drug-sniffing dogs, not random employees, so you shouldn't be afraid of "getting caught". Remember there's no law against carrying random powders, just against carrying illegal drugs.
However I wouldn't try the above when travelling to paranoid countries such as UAE, where people have been known to get arrested for carrying poppy seeds. In that case I'd recommend carrying the creatine in sealed tablets or some other clearly packaged form.