The recent intrusion into the training ground of the Singapore Armed Forces due to a duplication of a mechanical key was recently featured in CNA. 

https://www.channelnewsasia.com/singapore/man-jailed-enter-saf-protected-area-pick-pandan-leaves-2347196

Prevention of key duplication by contractors has been challenging to enforce in the past but now, with Willowmore’s Keyless Smart Padlocks, this is now possible. Willowmore’s Extra Heavy Duty smart padlock has been designed specifically to protect Critical Infrastructure. Our Keyless approach is simple – we implement our cryptography based on industry’s best practices and ensure that all access is recorded and checked.