Are there foreign customs agents on US soil?
According to this answer (and many others I've read), there are US customs officers on Canadian soil.
What about the reciprocal (Canadian, Mexican, Japanese, etc)?
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Can you bring soil through US customs?
Soil, Sand and MineralsNo soil or earth of any kind is allowed into the United States without a permit issued in advance by USDA Plant Protection and Quarantine Permit Unit. Pure sand, such as a small container of decorative beach sand, is usually allowed.Can you send soil to us?
Importation of soil into the United States from foreign sources is prohibited, and movement within the continental U.S. is restricted unless authorized by APHIS under specific conditions, safeguards and controlled circumstances described in a permit and/or compliance agreement.Can you take dirt from another country?
Soil from all other countries (and from Hawaii, Puerto Rico, and all U.S. territories) is prohibited from entering the United States without a permit and/or USDA-approved soil treatment.What is CBP agriculture?
The CBP agriculture specialists work with specialized x-ray machines that detect organic materials. They utilize agricultural canines specifically trained to sniff out meat and plant materials in international airport passenger areas.US Customs and Immigration Questions at USA Airport | What do they Ask? F1 Student Visa Guide
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