I don't know. I do know that 100% are screened here.
I heard that CBP screened all containers for radiation at the terminals of origin as part of CSI. I had the source several days ago but can't find it now.
When you say all are screened here, what specifically do you mean.
That may be true. I'm not totally up to speed on CSI. One thing to remember, CSI is not in every port that ships to the US, so we have to check them here also. It is possible, that the ones checked overseas through CSI may not get checked here. I'll check on out Intra net site next time I'm at work.