An employee at the Consulate-General of Japan in NYC spoke with TMZ and said Japan has strict policies on allowing people with recent drug convictions into their country, but deal with matter "on a case by case basis."
It's being reported that Paris must stay at an airport hotel until the matter is settled.
A rep for the Hilton says,
Paris Hilton was delayed by immigration authorities at a Japanese airport this evening after arriving for business obligations planned many months earlier. Paris was contractually bound to her business trip and didn't want to let down her brands and many Asian fans.