the motor will have d15b or b16a stamped on the the front of the block, left side. US motors have a digit after that last letter, jdm ones do not.
Look at the vin...japanese and euro are different than us ones
(how to read a US vin -
http://brickboard.com/ARCHIVES/2001MAY/10072150.shtml)
if it has passed inspection to drive on us streets, he will have a certificate