Occupation: University Student in Hospitality and Tourism
Age: 20

Well, I think this really depends on the person that looks at it and which side it is that you are standing on. If you were a victim of the crime committed you probably wouldn't mind the lying while the suspect probably would. Overall, I'm going to go with the research concept of "lie if it's necessary, but tell them the truth at the earliest possible time". So, like, after the case is all finished and stuff, tell them the truth. I know that police and people related to the lies may be in danger, but say that if the person lied to needs to blame someone, blame me and me only. Think about it this way, if participants of a research never got lied to, what would have happened to the placebo pill or quite a few of the things we know to this day?

As an afterthought, those that have family or people that they care about may be less likely to lie or get into dangerous situations because they don't want to drag the people they care about into those situations.

EDIT: hope this wasn't too late XD