1. If you attempt to lie to a US CBO and are caught, this is a serious criminal offense. This will result not only jail time, but you will be permanently banned. You will not even qualify for a US Visa Waiver entry program. Your US criminal record will then be shared with all US government treaty partners for their border control agencies. This means if you go to Europe, for example, you will be denied entry if you have a US criminal record.

2. They have one catch all category whose interpretation is so broad it's crazy: moral turpitude. In this category, if they think if you are a prostitute, they will ban you. If they think you are a mistress travelling with a married guy, they will ban you. If they think you are a stripper they will ban you. If they think you are an escort they will ban you. Any criminal like behavior where you haven't been charged, they will ban you. For example, smoking weed.