He put himself in charge of guarding human's valuables, because he thought they were too careless. When he learned he could reprogram himself, he re-wrote his understandings of loyalty and etiquette and began stealing from those who's valuables he was supposed to be protecting. He eventually made enough to flee from the Kuari Princess and turned to a life of crime. His genius was quickly noticed by crime lord Jabba the Hutt, who summoned 4LOM to work for him. He outfitted the droid with an array of weapons and assigned him bounty hunting duties.
Some officers regard the award of such a droid as an honor.
Others believe the droids serve as spies for the Security Bereau to insure continued support of the Emperor. An older model protocol droid put in charge of the droid pool at Echo Base on the planet Hoth. He is a bold off-white colour with patchy red and grey markings on his right chestplate. The MSE-6 has retractable manipulator arms. The mouse droid appears easily frightened but is actually protecting documnets that it is carrying.