Antimatter will annihilate when it comes into contact with any normal matter; it's not a chemical reaction. You can't make antimatter 'inert' because it's react

Antimatter will annihilate when it comes into contact with any normal matter; it's not a chemical reaction. You can't make antimatter 'inert' because it's reactivity doesn't depend upon some chemical property (arrangement of anti-electrons for example), but simply on the fact that it's antimatter. Hence the use of magnetic fields for containment since they prevent contact with ordinary matter. Your airport scanner would thus have to infer the presence of antimatter rather than detecting it directly (by looking for high-energy photons), but if your containment vessel is leaking then you have bigger problems than law enforcement :-)