Is it permissible to invest money in banks and take the interest from deposits or investment certificates, or to keep it in current accounts without interest, given the unavailability of other investment avenues, the lack of trust in someone to manage the money, and the suspicion of usury in all banks?

It is forbidden to deposit money in usurious banks and earn interest on it, or to place it in a current account there, because it is an assistance to what is unlawful. However, if no Islamic bank is available and there is a fear of losing the money, it is permissible to deposit it in a current account without interest due to necessity, which ceases once the necessity is gone. Transactions with Islamic banks that adhere to Sharia regulations and are supervised by reliable Sharia boards are preferable to dealing with overt usury.