No, the real question is would the US deliberately allow a group of people responsible for many terrorism deaths, and responsible for a recent attempt to kill hundreds of people in and below an approaching commercial aircraft, to continue to operate, recruit, train, and murder they way around....

Posada has been convicted in absentia in Panama, of involvement in various terrorist attacks and plots in the Americas, including: involvement in the 1976 bombing of a Cuban airliner that killed seventy-three people; admitted involvement in a string of bombings in 1997 targeting fashionable Cuban hotels and nightspots; involvement in the Bay of Pigs invasion; and involvement in the Iran-Contra affair (...) On September 28, 2005 a U.S. immigration judge ruled that Posada cannot be deported, finding that he faces the threat of torture in Venezuela.[18] Likewise, the US government has refused to send Posada to Cuba, saying he might face torture.[17] His release on bail on April 19, 2007 had elicited angry reactions from the Cuban and Venezuelan governments...

If some were capable enough to create such system, it stands to reason that some would also be capable of breaking such a system.

1. Stolen baggage.

Just ban all mobile phones and tablets and be done with it.