[RiseofAsia]

What LMW said is true and correct.
1. If foreign intervention poses a real risk, as in terrorist example cited by Shanmugan the person can be detained without trial under ISA..

2. If it is not a significant risk snd there isn't sufficient proof, then there is no justification for govt to act..

3. It is possible to use this law to falsely accuse someone and act against him.

4. This law is not good. WP and PSP  does not support a bad law. PAP supports the law.

Nobody will support a law to catch a person first without evident that he has committed a crime. We are not living in the ancient time when info is limited. 
Catch the person first, without any evident or proof onhand that he has committed a crime. (Only suspecting).
Then, take their own sweet time to find evident. 
What if they have suspected the wrong person?
What will be the CA?
Do you think this is a good way?