22. From the earliest times, it was appreciated that detention in custody pending completion of trial could be a cause of great hardship. From time to time, necessity demands that some unconvicted persons should be held in custody pending trial to secure their attendance at the trial but in such cases, "necessity" is the operative test. In this country, it would be quite contrary to the concept of personal liberty enshrined in the Constitution that any person should be punished in respect of any matter, upon which, he has not been convicted or that in any circumstances, he should be deprived of his liberty upon only the belief that he will tamper with the witnesses if left at liberty, save in the most extraordinary circumstances.