There's another costly trip wire that retailers hope to avoid by increasing scrutiny now.

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"The trip wire was knowing an attack was imminent, and also being able to pinpoint his location, " the official said.

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But even the boss can hit a trip wire.

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The burden of attaining citizenship is another trip wire.

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On an out-of-town trip Carlsbad state senator Joseph Gant Jr. read a wire- service story -- by chance -- about the Lyons fiasco and got on the telephone to other Carlsbad influentials.

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Years earlier on another trip to Asia, I saw cormorants whose owners had put wire collars around their necks to prevent them from swallowing their prizes.

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