The constraints are currently on the resources available for police to find the suspect. While prolific surveillance will make finding the X "persons of interest" easier + faster + more reliable, the constraint would then be on identifying other evidence and the court/prosecutor system to process plea bargaining and/or jury trials.
Additionally, jails and the resources concerned with jailing are very expensive (VERY large outlays and high upkeep) in the current high-cash-bail environment.
This will never be the case.
The constraints are currently on the resources available for police to find the suspect. While prolific surveillance will make finding the X "persons of interest" easier + faster + more reliable, the constraint would then be on identifying other evidence and the court/prosecutor system to process plea bargaining and/or jury trials.
Additionally, jails and the resources concerned with jailing are very expensive (VERY large outlays and high upkeep) in the current high-cash-bail environment.