Are there laws against falsely stating on a police report that you are someone's Power of Attorney ?

My uncles Tom had some mental issues all his life. He was an old fashioned guy and had been single all his life. He had a broken back from when he was younger and it healed but it left a big bump. His mental issues were usually brought on by mounting thoughts of people talking about him and depression, but they were treatable. He would usually seek treatment or medicine changes and be back to his home in a few days or a few weeks. I had just talked to my uncle not too long before all this & we had the best conversation. He was the same uncle Tom I knew all my life and I'm 52. Uncle Tom had told me in the past that He had made his deceased brother's ex-wife Joan the executor over his Will. He did not give her power of attorney. Well one day I try to call my uncle Tom to no avail. Some time passes and I get a call from Joan stating that my uncle was giving his money away thru phone scams and its all gone. She say's he wasn't paying his bills. She called the police and said she was his POA (at this Time she was Not). The police report shows she said this though. The police agreed that my uncle should see his doctor and reference his mental health and decision making. My uncle agrees to see his doctor. Joan states on the police report that she is going to take him to the hospital. In which she did. She had him committed. She told me this story: that on the way to the hospital he got a call from one of the phone scammers. At that time she say's "she yelled at him & fought the phone out of his hands and sat on it so he could not use it and he cried like a big baby". My uncle was 79 and could be stubborn, at the time it didn't hit me. She also told me that he had given away large sums of cash almost a year earlier. Well, a little time passed and we would get updates on his health from Joan (it was always the same story: he's curled in the fetal position grieving his money loss). Joan's daughter say's on face book that he didn't understand the money loss & kept telling me he had dementia. My uncle had told me he had Parkinson's. We ask for communication with him. Nope he can't talk with anyone they say. He's still grieving his money loss say's Joan. Emily, Joan's daughter say's she let us know when we can talk to him. Said he can't have visitors, we're not on his contact list. She say's he waves her (Emily) to go away when she goes to see him. She said she would set up a time to talk with him over and over. IT Never happened! They went on vacation at one time. THIS STORY IS TAKING PLACE IN ONLY 5 Months, beginning to end. Well this story started March 22,2018 according to the police report. On September 8,2018 he's dead! I never did ever talk to him again. I never got to ask if the money scam was real? Joan is very persuasive and persistent. My uncle's brother once told my father in a letter dated 2002 that "Tom acts like a 10 year old trapped in an adult body". How easy would it be for this manipulative woman to make my uncle believe something that wasn't true? I find out Emily moved into his house as soon as they got him into the nursing home. I find out he could get visitors. I talk to his priest who said he went to see him & he acted like himself. I talked to a cousin of his this week and she said he was fine but he was crying because he didn't want Joan as his PoA. When this whole thing started I got the feeling something wasn't right. Now I don't know what I can do about it. He died because Joan betrayed him. She took him out of his house just to get it for her daughter. I haven't spoken to Joan since September. I asked her to see his bank records, health records, and I told her I don't believe she did right by my Uncle Tom. I have been buried in this saga morning, noon,& night for 6 months praying on every aspect of it. I went to court to try and remove her as executor. Which didn't go well because I'm very shy. If anyone can help me in this situation please contact me. This did not have to end in uncle Tom's death.