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The move away from IWN also means that Justice will abandon the contracting system it had used to buy the network, under which different companies could bid for different parts of the work.

Instead, as part of its upgrade to current systems, the department will purchase 6,900 new handheld radios and 3,700 vehicle sets using a sole-source, no-bid contract with Motorola, Ms. Talamona said.

She said Motorola is the only manufacturer of radios that can operate securely on analog systems, like those used by most state and local law enforcement, and digital systems, like those used by federal agencies.

“Accordingly, the department purchased radios, using an existing sole-source contract with Motorola, justified for these reasons,” she said.

She added that as state and local agencies begin to upgrade to digital systems, “there will be increased opportunity for other vendors to participate.”