I would like to offer a bit of history related to the final report of the U.S. Naval Intelligence related to the matter you have raised, sir..
From Wikipedia:
<-> <-> <-> Copy Starts <-> <-> <->
Following Japan's attack on Pearl Harbor in 1941, concerns about subversive activity by Japanese Americans grew more pressing. ONI commissioned Kenneth Ringle, assistant district intelligence officer for the Eleventh Naval District in Los Angeles, to conduct a thorough investigation of the resident Japanese population. He found little evidence of Japanese American saboteurs, and in his final report to President Roosevelt, advised against mass incarceration, a view that was shared by most ONI officials, but that was largely ignored by the Army and War Department.
<-> <-> <-> Copy Ends <-> <-> <->
And I personally know that statement quoted above is accurate..