Worse, the scope of work pre-determines the solution by fixing the number and type of ads, often months before it is even clear whether so many ads are needed.

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"That takes the pressure off the electric barrier and buys all of us some time in finding a long-term solution, " which could include some type of watershed separation, he said.

WSJ: Great Lakes governors seek agreement on invasives

"Other than some type of key-recoverable system, there is currently no viable technical solution to this problem for law enforcement, " he said.

BBC: Security and law enforcement: the government view

For those who require RIM-type security and management approach, RIM remains one of the best well integrated solution.

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