"parens patriae"

— [parent of the nation]

"Malum in se"

— [Evil in itself]

"Modus operandi"

— [manner of working]

"de minimis non curat lex"

[The law does not concern itself with trifles]

(Source: thefreedictionary.com)

"Stare decisis et non quieta movere"

[to stand by decisions and not disturb the undisturbed]

(Source: Wikipedia)

"mens rea"

— [guilty mind]

"res ipsa loquitur"

[“the thing speaks for itself”] “a doctrine of law that one is presumed to be negligent if one had exclusive control of whatever caused the injury even though there is no specific evidence of an act of negligence, and without negligence the accident would not have happened”

Well you learn something new everyday now don’t you?  Thank you property book for one more Latin phrase to add to my arsenal of Latin phrases :) 

(Source: dictionary.law.com)

"Volenti non fit injuria"

[to the willing, no injury is done]

[Latin 1L1 #1]

"sic utere tuo ut alienum non laedas"

— [So use your own as not to injure another’s property]