Nigerians using US visas are strongly advised by the Nigeria Customs Service (NCS) to avoid using them for any illegal purposes, as doing so could result in severe repercussions.

Misuse = Risk: U.S. authorities may revoke, prosecute, or ban visa holders in the future if their actions diverge from their stated travel objectives, such as working, staying longer, or breaking import/export laws. Eye Witness News The Nation Newspaper.

Visa holders are subject to ongoing screening by U.S. security, even after they have arrived. Action may be taken in response to any suspicious activity long after it is reported in.

Travelers who have more than $10,000 USD must declare it at the time of entry or departure.