BY JENNIFER BABSON
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BOCA CHICA KEY - They worry about allergies and immune system difficulties and ailments yet to be diagnosed.

A few bolted for points north; others shuttered windows and stayed inside.

Word that the U.S. Army was conducting biological and chemical detection tests off Key West last week -- using a crop duster to spray what it says are benign substances over a small swath of the Gulf -- set alarm bells ringing for some on this island chain.

''Monday I had my house closed up all day and the air conditioner running because I was concerned and I couldn't find out what was going on. The newspaper didn't say exactly where they were dropping,'' said Bill Eardley, a retiree who lives on Sugarloaf Key. ``If I had known in advance, and I was concerned, I would have jumped in a car or plane and gotten out of here.''

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