In considering shield laws, reporters believe, and rightly so, that their sources will stop talking to them if is not guaranteed in some cases.

protection

Explanation: Shield laws protect journalist to revel the identity of the source of their confidential information, and Journalists however, rely on source protection to gather and reveal information in the public interest from confidential sources and such sources may require anonymity to protect them from physical, economic or professional reprisals in response to their revelations.

i do believe   by (keeping an organized record of all sources he or she referenced)good luck.

explanation:

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;