Is it necessary to administer an oath to a witness in courts that apply Islamic Sharia, and what is the meaning of the agent not taking an oath or being burdened (with one)?

According to the majority of scholars, it is not obligatory to administer an oath to a witness, although some scholars hold that it is. As for the agent, he is not required to provide evidence for the destruction of what is in his possession unless there is an accusation, because his possession is one of trust. However, if there is an accusation, he must take an oath, like other trustees.