[header] How to become a customs inspector [title] Be a citizen and resident of the united states. [step] Before you can be eligible to work as a customs inspector in the united states, you have to be a u.s. citizen who has lived in the u.s. for at least 3 of the past 5 years. You'll also need a valid driver's license. 
[title] Make sure you're in the right age range. [step] Us customs and border protection requires that applicants be referred for selection prior to their 40th birthdays.