"The Federal Police in an eastern German started border controls between Poland and Germany due to rising crime rates, seven years after checks at crossings were scrapped." See the article: Good bye Schengen: Get your
“The Federal Police in an eastern German started border controls between Poland and Germany due to rising crime rates, seven years after checks at crossings were scrapped.”
See the article: Good bye Schengen: Get your passport when traveling from Poland to Germany (TN, link)