Prisoner giving a blood sample to the state authorities for testing
Question

                A prisoner is asking if he can give blood to be tested  by the state so that the state will have a record of all the different blood types of past criminals.
Praise be to Allah.
    It does not seem that those who commit crimes have the same 
    type of blood, so there is no connection between blood type and human 
    behaviour. All kinds of people – good and bad – share blood types.

     What we advise this prisoner to do is to repent to Allaah 
    from whatever crime he has committed, and to restore people’s rights if he 
    has wronged anyone, and to make the most of his life before he dies and of 
    his good health before he falls sick, and  to hasten to repent to Allaah. 
    For Allaah will accept the repentance of His slave when he repents, and will 
    forgive him his sins.

     There is nothing wrong with giving a blood sample to the 
    state from the point of view of sharee’ah, so long as it will not be put to 
    a bad use and rather it will be used for prisoner records. But the prison 
    administration should be notified that the reason for criminality is not 
    blood type, rather it is corruption of the heart and mind, and growing up 
    with crime and continuing in it.

     If they want to deal with it, then they should tackle the 
    root of the problem by looking for the motives to commit crime and the 
    reasons why it develops, then try to put a stop to it and to reform the 
    criminals. There is nothing better than Islam for dealing with that.

     And Allaah is the Guide to the straight path.