Maybe I should work for DHS [fbo.gov]
Extremely difficult AND Extremely expensive!
p.s. The XDs is an amazing pistol. I have one, along with several others and is my favorite to shoot and incredibly accurate for such a short barrel/small frame handgun.
I have two XDMs. Just got the second one and haven't been to the range yet. Gonna pretty it up with tritium/fiber optic sights and a tactical light/laser first :o