Why Japan's process is lighter on background checks than Korea's
Unlike South Korea's E-2 visa, Japan's standard work visa categories don't have a blanket national requirement for an FBI-style criminal background check. That said, JET and some larger dispatch companies build their own vetting into the hiring process and may ask for a police check as part of their internal application, so treat 'no legal requirement' and 'no employer will ever ask' as two different things.
If an employer does ask for a US background check, the FBI Identity History Summary is still the most widely recognised document, and getting it apostilled through the US Department of State is the safe default even if Japan's immigration bureau itself doesn't demand it.
Japan guide for Canadians.
Japan guide for Australians.
Japan guide for UK passport holders.
