One of the problems that owners are facing is savy tenants, looking to cash in on toxic mold, exagerate health problems and bring cases to court. Even though they may not win a case, it can be very expensive for property owners who have to pay for legal defense. And of course there is no lack of personal injury lawyers who take cases on consignment and then try to settle (extort) out of court.
I have all tenants read and sign a Mold Addendum that explains who is responsible in what situations for mold problems. It is basically a legal shield for owners but there are always exceptions to the rule when a determined (greedy) tenant decides to make an issue out of it because they are tired of paying rent and are looking for a down payment on a home.