The events that cost the lives of four people need to be properly investigated.

Complaints by parents and others made to the Department were not properly investigated.

The victim of crime who just wants their case properly investigated.

All abuses by the security forces must be properly investigated.

We need to properly investigate the considered actions and risks.

There are some cases that you simply cannot investigate properly without an engineer's report.

None of these ancient remains have been properly investigated yet.

The assassination is still a very big question mark because it was never investigated properly.

The police were accused of not having properly investigated the missing person reports.

But failure by the police to properly investigate it is even more serious.