'Faith, family, football': How a Texas town is healing after a cop killed a black teenager

Full coverage: BioWatch under scrutiny

Since 2003, BioWatch air samplers have been installed inconspicuously at street level and atop buildings in cities across the country — ready, in theory, to detect deadly biological attacks. But the federal system has not lived up to its billing.

1 2
EDITION: California | U.S. & World