▁Dick son , ▁the ▁Court ▁recognized ▁three ▁categories ▁of ▁off ences : ▁▁ ▁True ▁Cr imes : ▁Off ences ▁that ▁require ▁some ▁state ▁of ▁mind ▁( m ens ▁re a ) ▁as ▁an ▁element ▁of ▁the ▁crime . ▁These ▁off ences ▁are ▁usually ▁imp lied ▁by ▁the ▁use ▁of ▁language ▁within ▁the ▁charge ▁such ▁as ▁" know ingly ", ▁" will fully ", ▁or ▁" int ention ally ". ▁▁ ▁Str ict ▁Li ability : ▁Off ences ▁that ▁do ▁not ▁require ▁the ▁proof ▁of ▁mens ▁re a . ▁ ▁The ▁act ▁alone ▁is ▁pun ish able . ▁The ▁duty ▁is ▁on ▁the ▁accused ▁to ▁have ▁acted ▁as ▁a ▁reasonable ▁person ▁and ▁has ▁a ▁defence ▁of ▁reasonable ▁mistake ▁of ▁fact ▁( a ▁due ▁dil ig ence ▁defence ). ▁The ▁Court ▁stated ▁that ▁the ▁due ▁dil ig ence ▁defence ▁" will ▁be ▁available ▁if ▁the ▁accused ▁reason ably ▁believed ▁in ▁a ▁mistaken ▁set ▁of ▁facts ▁which , ▁if ▁true , ▁would ▁render ▁the ▁act ▁or ▁om ission ▁innoc ent , ▁or ▁if ▁he ▁took ▁all ▁reasonable ▁steps ▁to ▁avoid ▁the ▁particular ▁event . ▁These ▁off ences ▁may ▁properly ▁be ▁called ▁off ences ▁of ▁strict ▁li ability ." ▁The ▁reason ▁for ▁this ▁is ▁that ▁the ▁Court ▁described ▁a ▁need ▁for ▁a ▁class ▁of ▁off ence ▁that ▁had ▁a ▁lower ▁standard ▁to ▁conv ict ▁than ▁True ▁Cr imes ▁but ▁was ▁not ▁as ▁har sh ▁as ▁Ab solute ▁Li ability ▁off ences . ▁As ▁opposed ▁to ▁the ▁first ▁category ▁of ▁off ences ▁in ▁which ▁the ▁accused ▁is ▁pres