I do believe there are ways to see through walls such as x rays, ultra violet light, heat detectors, thermal and more. Perhaps you will not be able to see through a wall if it's a very thick piece of concrete or something. Think about country laws, citizenships and immigration laws. The laws are clear to say who can cross the border and who can't. Registrations for ministries, passports and citizenships are very important. A lot of people take these laws very seriously. 513 Mexicans in 2 trailers is a surprising statistic. A Mexicanec that has Canada citizenship or USA citizenship has an advantage.
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