Hire a plumber to detect current leaks or past leaks by examining repaired and repainted sheetrock, or cupped wood flooring.

It starts to take a detective to figure out when the problems started and whose fault it was.

q=urine+detection+flashlight&oq=urine+detection+flashlight&aqs=chrome..69i57.7833j0j9&client=ms-android-tmus-us-sscr-revc&sourceid=chrome-mobile&ie=UTF-8.

I've had 4 different plumbers (one specialized in Leak Detection) out to the building and everyone said there was no leak.

The latter change is meant to reduce roofers’ opportunities to identify damage they can pin on past weather events, like hailstorms or hurricanes.Still, those changes might not reduce claims and lawsuits for several years, insurers say, if attorneys are allowed to pursue claims for old losses under the old rules.The Legislature provided the Department of Financial Services $1.8 million specifically to investigate property and casualty homeowner insurance fraud.Department spokesman John O’Brien said the money will fund two squads of detectives at the Division of Investigative and Forensic Services.Meanwhile, several insurers, including Citizens, Security First and Tower Hill, are pursuing claims under Racketeering Influenced and Corrupt Organization Act laws, developed to fight organized crime, against roofing companies they contend are engaging in fraud.The problem of roof-based coverage denials and ever-rising claims costs might not be solved until the concept of homeowner insurance in Florida is revolutionized, said Paresh Patel, CEO of HCI Group, which includes Homeowners Choice and Typ Tap insurance companies.Patel envisions a day when homeowners most likely to file claims for repairs, like roof replacements, are allowed to buy more expensive policies that are designed more as home maintenance coverage.

The first advice I'm going to give my friend is to go talk to the guy, or as a gentleman on this thread suggested, invite him over for a meal, coffee or beer with the goal of making a friend.If that action doesn't work, then put up the cameras, and as you suggested, signs saying the area is under surveilance.Next step is to put up a 10' chain link fence with barbed wire at the top, maybe privacy covers.Next step after that would be to go and talk to a detective, tell him what's going on and see if he can get the police on his side.

I didn’t know if I need to go so film detective noir with it or not, but it sounds like I do!

Also works for leak detection and runs off of 4G, so no wifi required. 

Have you thought about the solar-powered motion-detection lights?

When the phone company detects a single number making many calls in a row it flags the account and automatically assigns it that Spam caller ID.