Why are egg shells so weak lately?
When chickens first start laying eggs the shells are quite strong and thick. Making the shell requires calcium and once the surplus is depleted the shells get thinner and weaker. Most people offer ground oyster shells for their home raised chickens. Commercial egg farms probably have it in the food but it isn't enough
People complaining about Drugs being given to Chickens. Free Range Chickens aren't as healthy. Without the drugs the foul become sickly and thus thin shells.
Because of North Korea's nuclear test
You need to explain more.