ch and ise ▁while ▁accomp lices ▁dist ract ▁staff . ▁ ▁Career ▁crim inals ▁However , ▁there ▁are ▁people ▁and ▁groups ▁who ▁make ▁their ▁living ▁from ▁shop l ifting ▁and ▁other ▁cr imes . ▁They ▁tend ▁to ▁be ▁more ▁sk illed ▁career ▁crim inals ▁who ▁use ▁more ▁s oph istic ated ▁shop l ifting ▁tact ics . ▁Research ers ▁call ▁professional ▁th ieves ▁" boost ers ", ▁as ▁they ▁tend ▁to ▁res ell ▁what ▁they ▁ste al ▁on ▁the ▁black ▁market . ▁ ▁Leg al ▁definitions ▁Sh op l ifting ▁is ▁considered ▁a ▁form ▁of ▁the ft ▁and ▁is ▁subject ▁to ▁pro sec ution . ▁In ▁the ▁United ▁Kingdom , ▁the ft ▁is ▁defined ▁as ▁" d ish on est ly ▁appropriate [ ing ] ▁property ▁belonging ▁to ▁another ▁with ▁the ▁intention ▁of ▁perman ently ▁dep riv ing ▁the ▁other ▁of ▁it ; ▁and ▁" th ief " ▁and ▁" ste al " ▁shall ▁be ▁constru ed ▁accordingly ." ▁It ▁is ▁one ▁of ▁the ▁most ▁common ▁cr imes . ▁Sh op l ifting ▁pe aks ▁between ▁ 3 : 0 0 ▁and ▁ 4 : 0 0 ▁p . m ., ▁and ▁is ▁lowest ▁from ▁ 6 : 0 0 ▁a . m . ▁to ▁ 7 : 0 0 ▁a . m . ▁In ▁the ▁United ▁States , ▁shop l ifting ▁increases ▁during ▁the ▁Christmas ▁season , ▁and ▁arrest ▁rates ▁increase ▁during ▁spring ▁break . ▁R ut gers ▁University ▁cr imin ologist ▁Ron ald ▁V . ▁Clar ke ▁says ▁shop l if