DEA licensing is granted to those who qualify and apply and pay the fee contingent on the following
1) must be permitted by the state's laws as a mid-level practitioner to prescribe controlled substances (Schedule II-V). Here is the DEA sanctioned table: http://www.deadiversion.usdoj.gov/dr...ers/index.html
2) must be licensed within that state to practice - and have a license number
3) must be able to obtain the individual state's controlled substance license
4) then just apply - understanding that some state's allow fully prescriptive rights (ie: alaska) without supervision whereas some require that you follow protocols and sign scopes of practice
Now this only applies to controlled substances. If you want to prescribe other medications: ie: insulin, metoprolol, protonix, diflucan, birth control pills. Your prescription rights are again controlled by the state and is up to each pharmacy/pharmacist to determine whether the drug prescribed falls within your scope of practice.... for example a pharmacy may refuse to fill your prescription for uncle bob's chemotherapy as that doesn't fall within a CRNAs scope of practice (and surprisingly individual pharmacists as well as pharmacy chains have the right to randomly deny based on that)...
However, from a legal point of view - if you were to prescribe a birth control pill to a patient/family friend/relative and something were to occur and this case were to present itself in the court of law - you will be held liable for malpractice unless you can show that 1) the person is a provable patient of yours (has an H&P in your office) 2) you have examined the patient at one point or time 3) the medication you prescribed is within your scope of practice 4) and other evidence proving a patient-practitioner relationship.
(that is why those online pharmacies that prescribe viagra, etc... are suck risky schemes because the online prescriber is very, very liable for malpractice). Also why, it is very dangerous (risky to your license) to prescribe for non-patients (family members, friends).