Sometimes a person can be arrested simply out of an apprehension that he/she is likely to engage in unlawful activity and imprisoned for some time without proper evidence then this is known as preventive detention.
i) It looks like an effective tool in the hands of the govt. to deal with anti-social elements.
ii) Many people think that there must be greater safeguards in this law that it may not be misused against people for reasons other than that which are really justified.
iii) There is a clear tension between right to life and personal liberty and the provision for preventive detention.