Samadhi is a state beyond the brain frequency of zero when you see your body separate from YOU and YOU embark the journey to find who you are and once, you find who you are, all your karmas will resolve automatically.
This state can only be achieved by people who follow 11 steps of Karma Yoga. Other people who claim to tap Samadhi are tapping a lower brain frequency such as theta. For Samadhi, a person needs to be a Karma Yogi.
One of the techniques which we teach to attain Samadhi State is a 60,000 year old Secret meditation called 8th Chakra Meditation through which a practitioner can achieve union with the divine.