GRAND JUNCTION, Colo (KKCO)-- Days after a Mesa woman was murdered by her boyfriend and members of the community are asking why?

Robert Matile had been arrested for assaulting LaVon Hoffman just two weeks before.

There was a restraining order and he was ordered to wear a tracking monitor, but according to the coroner he wasn't wearing it the day of the murder, suicide.

Tracking device's used by Criminal Justice Services are designed to be as tamper proof as possible, research shows that in most cases the GPS technology works.

"Success under supervision, we find it very rare, that people are actually trying to tamper with them. They're usually a motivator to succeed undersupervision under conditions of their bond the court has embossed," says Criminal Justice Services manager, Joel Bishop.

The devices are designed to help motivate and keep offenders from committing crimes while they are under supervision.

"This device in particular will speak to the offender if they go in or out of the intruding zones, or we can send the device messages to talk with us," says Bishop.

And they are also meant to protect potential victims.

There is no magic formula to determine if an offender will receive a tracking device, the District Attorney's office takes it case by case.

"It might be a danger situation, or maybe the person may be inclined to retaliate or if a person has a violent history, anything of those kind of indicators are going to prompt me to ask the judge to order a GPS monitoring," says District Attorney, Pete Hautzinger.

And with the case involving LaVon Hoffman, Hautzinger says this is a very rare incident.

"I'm aware of two different cases in the last year or so, one very recently, and the other one in the last six months or so, where defendants have figured out one way or another to evade the GPS monitoring, I'd rather have it then not have it even though it's not perfect and even if it doesn't always work," says Hautzinger.

Hautzinger says he hopes that the technology continues to improve so we can avoid another case like we saw in the town of Mesa last week.

LaVon Hoffmans funeral was Wednesday in Cederridge, a fund has been set up at any Coloramo Credit Union.