Intoxication can be voluntary (D chooses to drink) or involuntary (where they don't choose this). Crimes can be specific intent, where intent must be proven, or basic intent where recklessness is enough.
shows if the intoxication prevented D from really intending the crime, he will be not guilty as his mens rea is negated but if D still intended the crime even though he was intoxicated, he will still be guilty as his mens rea is not negated
shows If the intoxication prevented D from realising a risk, he will be not guilty as his mens rea is negated but If D still realised the risk even though he was intoxicated, he will still be guilty as his mens rea is not negated