LISBON, Portugal (AP) — Portugal's new law on working from home makes the European Union country sound like a workers' paradise.

Companies can't attempt to contact their staff outside working hours. They must help staff pay for their home gas, electric and internet bills. Bosses are forbidden from using digital software to track what their teleworkers are doing.

There's just one problem: the law might not work. Critics say the new rules are half-baked, short on detail and unfeasible. And they may even backfire by making companies reluctant to allow working from home at all.

"The law is badly w...