The state has incredibe time saving devices, such as computerised fingerprint-readers and communications monitoring software that outstrip any technology available to their enemies.

In reality, it not so much forensic investigators as ruthless interrogators who are being facilitated by this law.
Extracting information is what it is all about and those who have experienced British interrogation techniques in the north of Ireland are aware, it is a nasty business. Torture is a cruel science. Alternative schools of torture inflict pain. either physical or more importantly psychological, which conceals the evidence. The latter requires more time but cannot be so easily detected by Human rights defenders.

After 28 days with trained and ruthless men you will be aware of every second, certainly not a lifetime Keith, but it will stay with you all of that time.