Is it enough to be "suspected" of terrorism, or should these suspects have the right to a fair trial before being detained indefinitely?

Suspects must have a trial before being detained indefinitely.

Explanation:

Suspects of terrorism must be detained immediately, as a measure of security and disaster prevention, since terrorist acts tend to be gradual and involve causing terror and deaths in the population.

However, in order for this suspect to be detained indefinitely, there needs to be a fair trial where evidence will be analyzed that places this suspect as guilty or innocent, making his arrest or freedom justified.