The use of force by police in Western Australia has once again been brought into question.

And, yet again it's because a man tasered by police and accused of assaulting a public officer has had the assault charge against him dropped due to a lack of evidence.

The latest case to grab the headlines is that of Ken Walker and his family, who became involved in an altercation with police on the night of his daughter's 21st birthday party.

It ended in his son, Ryan, being pepper sprayed and tasered by officers, his wife Raelene suffering a broken ankle, and both he and his wife being arrested and charged with obstructing police.

Security vision of the incident did not show the Walker's son assaulting one of the officers as police had claimed and that led to the case against the family coming undone.

Opposition MP John Quigley wants the case investigated by the Corruption and Crime Commission, along with the CCC's inquiry into the repeated tasering of Kevin Spratt in 2008.

"The police have been given a message by Minister (Rob) Johnson and by Premier (Colin) Barnett that they can do whatever they like and the government will cover their tracks.

"This has led to a total collapse of good policing in Western Australia."

Mr Quigley says the case highlights the need to introduce taser guns with cameras attached to them.

"With the CCC being so strong in its recommendation that all the taser guns should have cameras on top of them, the commissioner is strenuously opposing them and so is Rob Johnson for no good reason other than to cover up what's going on."

Acting Assistant Commissioner Gary Budge says he's reviewing information relating to the Walker case.

"I don't know yet that we can absolutely say that the video evidence isn't in accord with the evidence that the police provided. My understanding is that the video evidence was viewed, it was inconclusive in regard to the alleged assault on the police officer."

Until the internal investigation is completed, he says talk of an official apology to the Walker family would be premature.

Does taser use need to be reigned in?

Mr Walker argues the tasering of his son was unwarranted.

"They used it as a compliance tool which is against all of the rules in the guidelines for tasering under the police department."

He says he's angry no first aid was administered after the stun gun was deployed with his son's friend left to take two taser prongs from his back.

Mr Walker also says he's yet to see copies of the electronic taser records.

Police say all circumstances surrounding the tasering will be examined.

Acting Assistant Commissioner Budge says the length of time taken before the charges were dropped will be looked at.

"This matter certainly causes some concern when matters, ten months down the track, are discontinued. We will certainly be looking at our procedures and our processes to determine why we didn't identify earlier if there were weaknesses in the prosecution."

The charges were only dropped after the defence lawyer wrote a letter to the police lawyers highlighting deficiencies in the case.

The Criminal Lawyers Association's Linda Black says when police fail to properly investigate such charges at an early stage, justice is not served.

High costs

Ken Walker says it cost tens of thousands of dollars to mount the defence.

"Ten months of hell for us, we wouldn't want any other family to have to go through this."

Ms Black also holds concerns for other West Australians who may be charged with similar offences in the future.

"You'll also have people who can't afford to have a lawyer, who perhaps can't afford the ordeal or can't cope with the ordeal of a court process, so they plead guilty in circumstances where a proper investigation may well have indicated that they weren't guilty."

Acting Assistant Commissioner Budge says people who question police have nothing to fear.

The Walkers are far from convinced and want any talk of increasing police powers quashed.

They plan to make an official complaint regarding their treatment.

While they've got an apology from the Premier, they'll have to wait to see if they get one from the police department.

The Walkers will, however, get an opportunity to recoup some legal costs when they return to court later this week.