The Suffolk County Legislature passed legislation Tuesday to require all county buildings to post notices that wireless routers are in use.

The resolution, sponsored by Legis. William Spencer (D-Centerport), warns that every wireless device emits radio frequency radiation or microwave radiation. It notes that studies "that have looked at the effects of low-level RFR radiation on human cells and DNA have been inconclusive."

According to the resolution, Suffolk information technology staff will have to "label all locations of wireless routers with a sign" such as, "Notice: Wireless technology in use."

The bill passed unanimously, although some lawmakers said they didn't see the need and worried it might alarm the public.

"Is there a public health threat we ought to know about?" asked Legis. Jay Schneiderman (I-Montauk).

"As far as a specific issue of threat, there's a lot of varying opinion," Spencer responded. "It's taking something that's invisible and saying it's here."

According to the Federal Communications Commission website, "All wireless devices sold in the U.S. go through a formal FCC approval process to ensure that they do not exceed the maximum allowable" "specific absorption rate," a measure of the rate [radio frequency] energy is absorbed by the body.

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Spencer said the costs should be negligible.

Aides said Suffolk County Executive Steve Bellone will sign the measure.