▁a ▁cor ros ive ▁subst ance ▁in ▁a ▁public ▁place ▁unless ▁they ▁can ▁prove ▁they ▁had ▁a ▁good ▁reason ▁or ▁law ful ▁authority ▁to ▁do ▁so ▁( Section ▁ 6 ). ▁In ▁this ▁context ▁" cor ros ive ▁subst ance " ▁means ▁a ▁subst ance ▁which ▁is ▁capable ▁of ▁burning ▁human ▁skin ▁by ▁cor ros ion . ▁M aking ▁prov isions ▁for ▁cust od ial ▁sentences ▁after ▁a ▁person ▁is ▁conv icted ▁of ▁an ▁off ence ▁under ▁section ▁ 6 . ▁Am ending ▁the ▁Police ▁and ▁C riminal ▁Ev idence ▁Act ▁ 1 9 8 4 ▁to ▁include ▁reference ▁to ▁Section ▁ 6 ▁and ▁allow ▁for ▁police ▁searches ▁for ▁cor ros ive ▁subst ances ▁if ▁an ▁off ence ▁under ▁Section ▁ 6 ▁has ▁been ▁committed , ▁is ▁being ▁committed ▁or ▁is ▁likely ▁to ▁be ▁committed . ▁All ows ▁const ables ▁in ▁Scotland ▁to ▁det ain ▁and ▁search ▁a ▁person ▁without ▁a ▁war rant ▁if ▁there ▁is ▁reasonable ▁grounds ▁for ▁suspect ing ▁that ▁the ▁person ▁is ▁carrying ▁a ▁cor ros ive ▁subst ance ▁or ▁has ▁committed ▁or ▁is ▁comm itting ▁an ▁off ence ▁under ▁Section ▁ 6 . ▁This ▁section ▁also ▁allows ▁const ables ▁to ▁se ize ▁any ▁subst ances ▁found ▁during ▁a ▁search ▁if ▁it ▁can ▁be ▁reason ably ▁sus pected ▁that ▁the ▁subst ance ▁is ▁cor ros ive . ▁When ▁det aining ▁a ▁person ▁using ▁powers ▁from ▁this ▁section , ▁the ▁const able ▁must ▁inform ▁the ▁person ▁that ▁they ▁are ▁doing ▁so . ▁It ▁also ▁makes ▁it ▁an ▁off ence ▁to ▁intention