Selling things that may be used for haraam purposes

Dear Brothers & Sisters,
As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
My brother has a store that sells and installs radio systems, car t.v.'s alarms, tints on windows, big speakers,and amplifiers. Is this kind of business halaal?
We are in america and mostly teenagers would buy these type of things to make their car look nice and to make their music loud.
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Praise be to Allaah.

If it is known that this business will help these customers to engage in evil things and promiscuity, and that they will be used to listen to songs and music, then it is not permissible to sell these things to them. But if it is possible that they may be used for permissible things and it is not known that the purchaser will use them for haraam things, then there is nothing wrong with selling them or dealing in them. If he sees someone who seems to be decent and respectable, he may sell to him, and if a customer comes who appears to be promiscuous or an evildoer, he should refuse to sell to him.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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