12 year old lying and stealing

Hi need adice my 12 year old lying ald stealing! What can I do to break this habit? Stealing started a few months ago! Took my cellphone to school,loss privileges,stole some change laundry money,loss privileges,tv remotes under his bed,loss of privileges! then he lies about about,it wasn't me! Well no toher children except 2 dogs and hubby1 I want to break this habilt now,and don't know how? He is adoptive placement and planning to be adopted this August! Been with us about 9 months,what a long road we went through! Ideas,and Advice! Contact me! Beagle