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But some observers fear such developments could ultimately lead to robots capable of deciding on their own when to shoot and kill.
"It's one more step in that direction," said John Pike, director of GlobalSecurity.org, an Alexandria, Va.-based military research organization.
"It is not the first step in that direction, but I think at some point toward the end of the next decade, you're going to start seeing RoboCops, or a Terminator," Pike said, referring to a pair of 1980s robot-themed sci-fi films. "We may see autonomous robots capable of inflicting lethal force."
Jim Rymarcsuk, vice president for business development at Burlington, Mass.-based iRobot, said notions of armed robots acting on their own are far beyond what the company envisions for the partnership announced Thursday with Scottsdale, Ariz.-based Taser International Inc.
"Right now, we have no plans to take any robot with a lethal-weapon approach to the market," Rymarcsuk said. "For this system, and all systems we have looked at, there is a human in the loop making the decisions. This in no way is giving the robot the capability to use force on its own."
Financial terms of the partnership were not disclosed. The companies said they have developed a model that will be demonstrated at a conference Taser is holding in Chicago on July 9-10. The model pairs iRobot's existing PackBot Explorer with the Taser X26 in what iRobot calls "the first robot of its kind with an on-board, integrated Taser payload."
There's no word when the system will be offered for sale, or for how much.
The system isn't entirely unprecedented. Foster-Miller Inc., a Waltham, Mass.-based rival of iRobot, already offers a version of its track-wheeled Talon robot that can be fitted with a Taser with laser-dot aiming capability.
The Taser, used by thousands of law enforcement agencies, is an electric stun gun designed to help officers subdue violent suspects without nightsticks or guns.
However, some critics contend the weapon can be deadly, particularly on suspects who use drugs or suffer from heart problems. Taser International and police counter that no weapon is risk-free, and that Tasers actually save lives by helping officers avoid more dangerous weapons.
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 For iRobot, its Taser-equipped system will be the first robot capable of using force to disable a person, rather than a bomb. The 17-year-old company is best known for its mobile robots for the consumer market, including the disc-shaped, carpet cleaning Roomba.
But home robots account for only 60 percent of the company's revenue. The rest comes from government and industrial customers, including the military and police.
Versions of iRobot's PackBot have disarmed roadside bombs and searched caves and buildings in Iraq and Afghanistan. Some scout dangerous areas before soldiers or emergency responders go in.
With the Taser venture, iRobot "is testing a new market, and they've found a cheap way to do it," said Alex Hamilton, an analyst with The Benchmark Co. "The PackBot works. You'll need software to make it work with the Taser, but my guess is they will be able to achieve it."
Pike at GlobalSecurity.org envisions police SWAT teams and prison guards using Taser-equipped robots to deal with hostage situations and unruly inmates. He also expects they could supplement
-- or even replace -- human guards patrolling property.
"I could see rent-a-cop companies wanting to buy it, I can see corrections departments wanting to buy it, because it might be seen as a cost-effective alternative to having a human guard patrolling a perimeter," Pike said.
Pike says Taser-equipped, remote-controlled robots are still a few steps away from becoming killing machines. If that happens, the development would run counter to a robots-should-not-harm-humans principle that classic science fiction author Isaac Asimov outlined in his 1950 anthology, "I, Robot"
-- the namesake of iRobot the company.
"For now, as soon as you let go of the joystick, the robot just sits there," Pike said. "So questions of moral agency don't arise
-- that is to say, whose finger is on the trigger. But a little further down the road, when these ground vehicles do achieve greater autonomy,
... [there] may be no human finger on the trigger."
[Associated Press;
by Mark Jewell]
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