Often when you have a leak at home, your first call maybe to a local plumber or your Insurance Company. If you have trace and access on your policy, the detection should be covered by Insurer, but strangely not the repair.
Insurers have appointed companies who in the main are adequate but more often than not have little or no experience or the very least "do it" as a means for further work, i.e. the strip out and drying of refurbishment.
The often used example of a less skilled technician/engineer is to default to using tracer gas. It's the "I have no idea what to do next, maybe this will work", often it can work but is expensive and more importantly if in the wrong hands, dangerous. There is no competency requirement and can be used by those who have no understanding of plumbing networks or the potential of causing issues with pressurised systems.
Identifying causes of high moisture levels should always be carried out with minimum of destructive methods, a competent technician will use all his available tools to diagnose.
I was recently asked by a non specialist leak detection technician whilst carrying out works on behalf of an insurer that they had found an above ground leak and wanted to know how to find a possible second leak. This is so concerning, how can this be a "expert" service? when the fundamentals of science are so very absent.
To summarise, don't trust what the insurer sends, there could be some good one's, but more likely it'll be misdiagnosed.
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