It appears the government screwed the pooch and then tried to cover it up by crying "Terrorism!!!". Wow! You mean government officials will lie to cover their backsides? Who could have seen that coming? (/sarcasm)
An article from Wired says that Prof. Ibrahim was initially placed on the no-fly list due to clerical error. Then the Justice Department spent years basically lying to the courts in an attempt to avoid embarrassment. Does anyone think TSA would falsely claim "SSI" just to avoid disclosing embarrassing facts, too?