California Medical Marijuana Patients versus Drug Testing for employment

I was laid off  last year by a well known international company on May 3rd, 2011 a long with 38 people. Needless to say I had 2 surgeries that same week and I was able to land the disability that I had paid into with my own money.  Well that tax free disability ended yesterday.....so I start calling jobs and am open about my medical Marijuana prescription because I view it as a medicinal herb not a street drug like Meth or Cocaine.  They have a copy on file at my last employer who did say I am eligible for rehire if another opening comes up & they let me stay on board for 5 yrs before the mass layoff due to lack of sales.  I live in California where "Pot Shops" are on every corner, people walk down the street puffing feeling free out here as it should be anyway.  So I talk to an employment recruiter yesterday who is behind me all the way but she says (regarding my prescription) "Herbalife (the company she wants me to interview at,no pun intended) goes by Federal law not State law"....what baloney, if the company is in the state than it should abide by the state unless its terribly drastic.  My work is proficient and my medicinal usage did not once affect my work (even won an award), nor did I take it during working hours.  So now I feel caught between a rock and hard place because I don't feel I should have to hide what my doctor gave me which has had tremendous results on my medical condition.  Living in a state with the most permissive laws in the country I find it absurd that a Japanese international owned company allowed me to work, but not an American company based here in Los Angeles well at least Herbalife.  I haven't responded to the offer yet because I feel like I have to run to the "head shop" and go spend $30 on something thay may or may not mask it.  There are companies who only do background checks, but drug testing is intrusive and expensive for most companies.  People are on all kinds of prescriptions that are much more mind altering than an herb that grows in the ground, like Xanax, Prozac, Valium, Vicodin...etc. Oh but that's ok...(sarc)  I am not going to give up what my doctor has helped me with to tremendous results just because some company wants to poke into to private life.  I have made it this far and I have enough faith that someday this won't be such a bump in the road for patients who want to get out there and work effectively & proficiently.  Not everyone is a Beavis and Butthead.