Please check Travel & General Status Information if you are traveling outside the U.S.. Specific information is available for trips to Canada and Mexico and for Visa Waiver visitors.
It is illegal and you can be fined, detained, or denied entry to the U.S. if you are carrying restricted food items or other prohibited agricultural or animal products. If you wish to research the exact prohibitions see more information.
In general it is best to avoid bringing food, agricultural, or animal products. An example would be apples, oranges or a meat sandwich.
Make sure to check the lists before you leave for your trip to the U.S.
The U.S. Customs and Border Protection (CBP)
Items include food, pets, and medication.
Transportation Security Administration (TSA)
Lists of items that can be in carry-on baggage and that need to be in checked baggage.
Arrests or convictions for driving under the influence of drugs or alcohol (DUI) or driving while intoxicated (DWI) may result in the cancellation (also called "revocation") of your visa by the U.S. Department of State. Your visa is the sticker pasted into your passport by the U.S. Embassy or Consulate, and is required for entry to the U.S. A visa cancellation/revocation does not end your current immigration status if you are already inside the U.S. However, if your visa has been cancelled/revoked, and you leave the U.S., you will need to apply for a new visa to return to the U.S. Click here to read the regulation: https://fam.state.gov/fam/09FAM/09FAM040311.html
If you or your combined family members are carrying $10,000 or more, you must list your total (family) funds on one U.S. CBP Declaration 6059B Form and you will be required to complete a FinCEN Form 105 Report during secondary inspection. There is no fee.
Definition of monetary instrument on the required finCEN Form 105 Report
It is a requirement to declare the total of all funds over $10,000 U.S. dollars being carried by an individual or a family group. A single U.S. Customs and Border Protection Declaration Form 6059B must be used to add up and declare all funds even if carried separately by family members.
For any visitor entering the U.S. under the Visa Waiver Program it is necessary before traveling, to register with the Electronic System for Travel Authorization (ESTA).