The biggest blooper is that the accident happened 2 years back. He would have definitely not started taking drugs on day one
It would have been at least 3-4 weeks post that and ShivRu wouldn't have found Om on the first day he would have taken drugs as first time user need not be taken to rehab, that is for addicts, So he must have found that much later hence and he is in the house for at least 6 months (since the show started) after being back from rehab, so was it that easy for him to get out of drugs, like seriously is that so easy??