Immigration Query Regarding Police Clearance

Anyone who have background on immigration processes? I have query, if you can, supposed I go outside of my country and lived in another country. When I go back to my home country I forgot to obtain a police clearance supposedly from Middle east countries,. Now, I'm migrating to a western country and I cannot obtain the needed police clearance. Is there possible way to be approved of visa without the needed police clearance?

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