DENVER (AP) -- Colorado auditors say the state has lost track of hundreds of tanks of a dangerous fertilizer that can be used to make methamphetamines.

State lawmakers expressed concern Monday after the agriculture department admitted it does not have an accurate inventory of all anhydrous ammonia tanks in Colorado in violation of state law. Auditors say they've also found duplicate identification numbers and incomplete records.

The tanks contain a colorless gas used in agriculture.

Republican Sen. Dave Schultheis said authorities need to be notified if the tanks are stolen.

Department officials say use of the fertilizer is declining because of cost and they don't have the money to track tanks that aren't being used.

Copyright 2010 The AP.

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