Fir loged under ipc 302

My brother-in-law is a supervisor in a blind school. An indecent took place in that school. In one morning some students as well as some officials called him up over phone stating that one boy in that school has committed suicide. He was at his quarter complex at that time . Hearing that he rushed to the boarding school premise and found such happening as per the reporting he has been made over phone. He then called up police . The police rushed to the situation and seized a suicide note. That note contains some allegation leveling acquisition towards the Principal,the Supervisor,i.e. my brother-in-Law's name and some other officials. The police has apprehended my brother-in-law and placed before the Court in the following date. He is now given 10 days zail sentence. He is accused of IPC 302, The police however has not shown the suicide note in the Court. The others including the Principal of that school who is also accused in that suicide note has also been not brought to the purview of the Court. The boy committed suicide has several acquisition against his name by the school management. That boy has earlier been found to be guilt of breaking rules and regulation of the School and the maters have earlier been taken to the cognizance of the school committee who have found that boy guilty. The boy had a grievance that why the committee has punished him by rusticating him from the school. So he mentioning all the names of the personnel in the school committed suicide. Now my brother-in-law is made the sole accused and is sent for jail for 10 days as non-bailable warrant is issued against him only .We wish it to know what should be our approach given the above circumstances. He is working under Social Welfare Deptt. He is amidst such situation because of his official duties. But it is certainly not expected that a person should every time have a look towards each and every student and their activities. So how can a person like he may be accused. Please advise us . We consider worthy your such valuable inputs in this regard.