I have no problem with this, opiate addiction is a yuge problem. Shouldn't it be pretty universal that people want there candidate to try to propose solutions to problems we face. Seems like if anything they are trying to take the position of drug addictions as a public health issue, which is exactly what we need to be doing. If your kid is a dope head wouldn't you want your doctor to let you know about it?
Absolutely. Let's just take the next logical step and drug test all citizens. Those who fail can be mandated to state sponsored detox centers. Make it mandatory as a condition of employment or schooling.
There is no limit to all of the good a powerful central government can do.