when handled by (N), becomes a different result
Expresses that when something is handled by a particular person or thing, the outcome differs from the expected or usual result.
This pattern is used to say that when a certain person or thing takes charge of a situation, the result changes—often for the better or worse. The core image is 'depending on who/what handles it.' It's common in spoken Japanese and conveys a sense of admiration, criticism, or irony, depending on context. The different forms are mostly interchangeable, but にかかっては and にかかったら are more conversational, while にかかると is slightly more neutral or written. Choose based on nuance: にかかっては emphasizes the situation as a given premise; にかかったら adds a conditional 'if it becomes that case'; にかかると is more straightforwardly conditional. In practice, you'll hear にかかっては and にかかったら most often in speech.