what’s the whole deal with taweez? i’ve never understood it 
i do kno a bit bout it that ppl wear it to b safe from the evil shaytaan/jadoo etc. no?
anyways i’ve been very curious bout this and kala jadoo(black magic) stuff and what Islam has to say about it
so please if someone has any hadeeths or something, do post it up
Jazakallah in advance 
Praise be to Allaah.
Firstly:
It is not permissible to go to fortunetellers and soothsayers and other such charlatans. Whoever goes to them and asks them about anything, his prayer will not be accepted for forty days, and whoever believes their claim to have knowledge of the unseen or to be able to relieve hardship and bring benefits is a kaafir, as it says in the saheeh ahaadeeth narrated from the Prophet (peace and blessings of Allaah be upon him).
It is not permissible to use turquoise (as a charm) and amulets. A stern warning is used in the saheeh Sunnah to the one who does that.
It was narrated from ‘Uqbah ibn ‘Aamir al-Juhani that a group of people came to the Messenger of Allaah (peace and blessings of Allaah be upon him), and he accepted the allegiance of nine and refrained from accepting the allegiance of one. They said: “O Messenger of Allaah, you accepted the allegiance of nine and not this one.” He said: “He is wearing an amulet.” He put his hand in and took it off, then he accepted his allegiance, and said: “Whoever uses an amulet has committed shirk (has associated partners with Allaah).” Narrated by Ahmad, 16969. This hadeeth was classed as saheeh by Shaykh al-Albaani in al-Silsilah al-Saheehah, 492.
In the answer to question no. 10542 you will find the details of the ahaadeeth which have been narrated concerning amulets, and the rulings of the scholars on amulets containing verses from the Qur’aan and amulets consisting of other things.
In that answer, Shaykh Sulaymaan ibn ‘Abd al-Wahhaab is quoted as saying:
“This scholarly difference was concerning hanging up amulets which contain Qur’aan or names and attributes of Allaah, so what do you think about the things which were innovated later on, doing spells (ruqyah) using the names of shayaateen (devils) and others and hanging them up, and even being attached to those shayaateen, seeking refuge in them, slaughtering animals for them, asking them to ward off harm and bring benefits – actions which are pure shirk? This is prevalent among many of the people, except for those whom Allaah keeps safe and sound.”
And Shaykh Haafiz Hukmi said:
If they (amulets) contain anything other than the two revelations and instead contain mumbo-jumbo from the Jews or worshippers of the temple, stars or angels, or those who use the services of the jinn, etc., or they are made of pearls, strings, iron rings, etc., then this is shirk, i.e., hanging them up or wearing them is shirk, beyond a doubt.
http://63.175.194.25/index.php?ln=eng&ds=qa&lv=browse&QR=20349&dgn=4
Is it permissible to use witchcraft to achieve a good purpose?
Praise be to Allaah.
Witchcraft or magic is knowledge that comes from the shayateen and is something that they do. Allaah says (interpretation of the meaning):
“They followed what the Shayaateen (devils) gave out (falsely of the magic) in the lifetime of Sulaymaan. Sulaymaan did not disbelieve, but the Shayaateen (devils) disbelieved, teaching men magic [al-Baqarah 2:102]
“And they learn that which harms them and profits them not. And indeed they knew that the buyers of it (magic) would have no share in the Hereafter” [al-Baqarah 2:102]
“and the magician will never be successful, to whatever amount (of skill) he may attain” [Ta-Ha 20:69]
The Prophet (peace and blessings of Allaah be upon him) said: “Avoid the seven sins which doom a person to Hell.” They asked, “What are they?” He said, “Associating anything in worship with Allaah (shirk); witchcraft;…”
And the Prophet (peace and blessings of Allaah be upon him) said: “He is not one of us who practices witchcraft or has it done for him.”
On this basis, it is not permissible to use witchcraft for any purpose whatsoever. Witchcraft or magic is falsehood, and all kinds of falsehood are kufr and evildoing. Sin cannot be a means of achieving something good. Beneficial things have to be sought through the prescribed means which involve no sin and whose consequences are safe. Allaah has given His slaves sufficient means in the things that He has permitted them, so they have no need for the things that He has forbidden. To Him be praise and thanks for His blessings.
Shaykh ‘Abd al-Rahmaan al-Barraak (www.islam-qa.com)
http://63.175.194.25/index.php?ln=eng&ds=qa&lv=browse&QR=10173&dgn=4
Response: If that piece of animal skin is put on the child as a kind of amulet to protect the child from harm or to bring about some good, then that is forbidden, and could even be a form of shirk. If it is put for a sound reason, such as to keep the navel from bulging or to strengthen the back, then there is no harm in that.
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet (sal-Allaahu `alayhe wa sallam) and his family and his companions.
The Permanent Committee for Islaamic Research and Fataawa
Fataawa al-Mar.ah
Response: This is an objectionable act and there is no sound source for it. It is not allowed to do such a thing. What is legally sanctioned is to seek refuge from them by Allaah's complete words from every devil and poisonous pest, as has been confirmed from the Prophet (sal-Allaahu alayhe wa sallam). He used to seek protection by those words for his grandsons al-Hasan and al-Husayn Ibn 'Alee. It is also sanctioned to make dua for them by asking Allaah to protect them from every evil. As for putting a knife or something similar, of iron, wood or other substances, with the belief that such will protect them from the jinn, it is an evil practice that is not allowed. Similar is the ruling with respect to hanging an amulet over them, which is what is called al-tama'im. This is not allowed because the Prophet (sal-Allaahualayhe wa sallam) said:
((Whoever hangs an amulet, Allaah will not complete[his affair] for him)).
In another narration, the Prophet (sal-Allaahu `alayhe wa sallam) said:
((Whoever wears an amulet has committed shirk)).
May Allaah bestow understanding of the religion upon all Muslims, and steadfastness in the religion. We seek refuge for ourselves and them3 from everything that differs from His pure law.
Shaykh Ibn Baaz
Fataawa al-Mar.ah
Assalam Aleekum
To the best of my knowledge Its allowed for children
and insane people but not allowed for the rest of
the people.
take care