▁activity ▁of ▁interest ▁to ▁law ▁enfor cement , ▁usually ▁by ▁a ▁source ▁outside ▁of ▁the ▁law ▁enfor cement ▁ag ency . ▁A ▁tip ▁might ▁provide ▁law ▁enfor cement ▁personnel ▁with ▁a ▁direction ▁to ▁purs ue ▁in ▁the ▁investigation ▁of ▁a ▁crime , ▁and ▁it ▁might ▁be ▁made ▁an onym ously , ▁or ▁by ▁a ▁known ▁source ▁whom ▁the ▁recip ient ▁might ▁have ▁reason ▁to ▁trust ▁or ▁dist rust . ▁In ▁United ▁States ▁law , ▁by ▁itself , ▁a ▁tip ▁generally ▁does ▁not ▁provide ▁probable ▁cause ▁to ▁make ▁an ▁arrest ▁or ▁perform ▁a ▁search ▁of ▁someone ' s ▁property , ▁but ▁it ▁may ▁be ▁a ▁factor ▁contrib uting ▁to ▁probable ▁cause ▁if ▁cor ro bor ating ▁evidence ▁can ▁be ▁found . ▁ ▁Many ▁law ▁enfor cement ▁ag encies ▁maintain ▁a ▁tip ▁line ▁to ▁enable ▁citizens ▁to ▁report ▁susp icious ▁activities ▁generally , ▁or ▁to ▁provide ▁information ▁about ▁a ▁particular ▁crime ▁currently ▁under ▁investigation . ▁ ▁References ▁ ▁Category : L aw ▁enfor cement <0x0A> </s> ▁Auth entic ▁Science ▁F iction ▁was ▁a ▁British ▁science ▁fiction ▁magazine ▁published ▁in ▁the ▁ 1 9 5 0 s ▁that ▁ran ▁for ▁ 8 5 ▁issues ▁under ▁three ▁edit ors : ▁Gordon ▁Land s borough , ▁H . J . ▁Campbell , ▁and ▁E . C . ▁T ub b . ▁The ▁magazine ▁was ▁published ▁by ▁Hamilton ▁and ▁Co ., ▁and ▁began ▁in ▁ 1 9 5 1 ▁as ▁a ▁series ▁of ▁nov els ▁appearing ▁every ▁two ▁weeks ; ▁by ▁the ▁summer ▁it ▁became ▁a ▁month ly ▁magazine