The problem with Apple's supposed monitoring is that companies like Foxconn are tipped off ahead of time and fake compliance with Apple's rules. Apple knows this. It is all a big show for us western consumers and has nothing to do with ensuring people won't get crippled for life making iPhones.
In fact it was revealed that Foxconn has a squad of the oldest workers they have and when they hear an inspection is coming they move them in so they will have no underage workers found.
The biggest example of the disconnect between what Apple says and what is really happening is best illustrated by this example. President Obama was at a fund raising dinner and asked Steve Jobs what it would take to get iPhones manufacturing to come back to America. Jobs said "Those jobs aren't coming back". The example given for why that was the case was this (concerning replacing the screens only weeks before launch):
Originally Posted by Apple executive
A foreman immediately roused 8,000 workers inside the company’s dormitories, according to the executive. Each employee was given a biscuit and a cup of tea, guided to a workstation and within half an hour started a 12-hour shift fitting glass screens into beveled frames. Within 96 hours, the plant was producing over 10,000 iPhones a day.
Of course when the NYTimes followed up to confirm that story with Foxconn this is what they said:
Originally Posted by NYTimes, Foxconn
The company disputed some details of the former Apple executive’s account, and wrote that a midnight shift, such as the one described, was impossible “because we have strict regulations regarding the working hours of our employees based on their designated shifts, and every employee has computerized timecards that would bar them from working at any facility at a time outside of their approved shift.” The company said that all shifts began at either 7 a.m. or 7 p.m., and that employees receive at least 12 hours’ notice of any schedule changes.
So basically Foxconn can't admit that happened b/c it is illegal under Chinese labor laws, but the Apple exec holds it up as the big reason these jobs are staying in China. It is the lack of labor protections that give them the flexibility US companies desire, as well as the limited liability against worker claims and low wages. Apple pretends it is trying to prevent abuses but really the only reason they stay in China is because they can get away with these abuses by proxy.