Knowing how the target is fit is not ‘invaluable’ in regards to knowing how to destroy them. It’s a little helpful, but definitely not ‘invaluable’. Knowing their cargo is relatively helpful in knowing whether or not you want to destroy them, sure. That doesn’t mean it directly impacts you at all, however.
The action that has a direct impact upon you is the one people get CONCORDed for.
Its not punishable by death, just enables defensive aggression against a player that commited a suspect level act. How you survive after going suspect is up to you.
This is EVE, not IRL.
But if you want to do the IRL route, scanners that detect the speed detectors used by police are illegal in möst countries. Even if a device existed to scan under the hood or boot of a car or truck at distance, it would be illegal to use it, unless you are official of an authority entitled to do so.
If someone goes suspect, they can be killed for going suspect. That is what ‘punishable by death’ means. It means it can be punished by the offender being killed. It doesn’t mean death is guaranteed. It means it’s an option that is considered acceptable for those who wish to punish the offender to use.