How to Make Aluminum Wiring Safe
Aluminum wiring is safe. The biggest issue it creates is the fact it expands and contracts within the box for a switch and receptacle and causes issues at the terminal where it connects to these items.  Copper does not do this, so that is why we use Alumiconn connectors to transfer from aluminum to copper. Inside the breaker panel, as long as the breakers are CU/AL certified, then aluminum can be terminated on those breakers.