An update on my Brother inLaw

I mentioned a while ago that my B-I-L was ill and was having quite delusional ideas.
Yesterday his doctor finally agreed to visit and returned soon after with a psychiatrist and two social workers so that they could section him under the mental health act. Because the doctor believed BIL to be threatening they also brought a number of police officers. BIL could not understand why they wanted to put him in hospital and surmised that they were unaware of his divinity, because they were insistent he did become aggressive and consequently 4 police officers attempted to restrain him. One officer was bitten but they got handcuffs on him and dragged him down the street (in his underwear) to a police van. we have now found that between the house and the hospital the police found it necessary to use CS gas spray on this frightened, very ill, handcuffed man.
my MIL is obviously very distressed and she and my partner are considering making a formal complaint.
We are relieved that he is now in hospital and can begin the treatment to stabilise his condition but we are also very angry that he had to become so ill before anyone could\would do anything.