Can he buy meat from a non-Muslim butcher who says that it is halaal?
Question

                If a none muslim butcher claims that he is selling halal meat and chicken is it ok to buy from him. if any of our friends buying from his shop can we eat that meat.Keeping in mind that there are two halal meat shops in our area runing by muslim brothers.
Praise be to Allah.
    Firstly: it is better for you to buy the meat you need from 
    Muslims, because this is more on the safe side and there is less likely to 
    be any doubt concerning it. You will also be helping the Muslims to continue 
    their work for which there is a need in the western countries. Moreover, the 
    Muslims undoubtedly deserve this business more than others. It is sufficient 
    for the Muslim to feel that he is renewing his bonds of faith with his 
    Muslim brothers every time he forsakes the stores that are owned by kuffaar 
    that may be closer to him or sell goods for cheaper prices, to buy from his 
    brothers in faith. See question no.
    9205. 

    Secondly: If the non-Muslim butcher is not from among the 
    People of the Book, then meat slaughtered by him is not halaal. If he is 
    from among the People of the Book, Jewish or Christian, then meat 
    slaughtered by him is halaal. 

    Ibn Qudaamah said: The scholars are unanimously agreed that 
    it is permissible to eat meat slaughtered by the People of the Book, because 
    Allaah says (interpretation of the meaning): “The 
    food (slaughtered cattle, eatable animals) of the people of the Scripture 
    (Jews and Christians) is lawful to you” [al-Maa'idah 5:5]. 
    Al-Bukhaari said: Ibn ‘Abbaas said: “Their food” means meat slaughtered by 
    them. Al-Mughni, 13/293. 
After that we do not need 
    to ask them about the way in which they slaughtered it, because the basic 
    principle is that their slaughter is valid because it was done by them as 
    People of the Book. See question no.
    20805. 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said: 

    It is proven in Saheeh al-Bukhaari (no. 5507) from 
    ‘Aa’ishah (may Allaah be pleased with her) that some people came to the 
    Prophet  (peace and blessings of Allaah be upon him) and said: “Some 
    people bring meat to us, and we do not know if they mentioned the name of 
    Allaah or not.” He said: “Say it yourselves then eat.” 
I [Shaykh Ibn ‘Uthaymeen 
    is speaking] say: They were new in Islam, and they did not know whether they 
    had said the name of Allaah or not, so he said: “Say it yourselves, then 
    eat.” So eating it is permissible even if we do not know whether the one who 
    slaughtered the meat mentioned the name of Allaah or not. Similarly it is 
    permissible to eat even if we do not know whether the meat was slaughtered 
    in the proper manner or not, because if the action is carried out by the 
    right people then the basic principle is that it is valid, unless there is 
    evidence to the contrary. So if some meat comes to us from a Muslim, a Jew 
    or a Christian, we should not ask about it or ask how it was slaughtered or 
    whether the name of Allaah was mentioned over it. It is halaal so long as 
    there is no clear proof that it is haraam. This is a way in which Allaah has 
    made things easier for us. Liqaa’aat al-Baab il-Maftooh, 1/77 

    It is clear from this that if you buy from this store and eat 
    the food of the one from whom you buy it, there is nothing wrong with that 
    and you do not need to ask him about the way in which the meat was 
    slaughtered, unless you become certain that he has slaughtered it in a 
    manner that is not prescribed, such as stunning the animal until it dies and 
    so on. But it is better to buy from the Muslim as stated above. 

    And Allaah is the Source of strength.