The term „common law” is often used as a contrast to Roman „civil law,” and the basic processes and forms of reasoning in the two are very different. Nevertheless, there has been considerable cross-fertilization of ideas, while the two basic traditions and principles remain different. Several decades after independence, English law still exerted an influence on American common law – for example with Byrne v Boadle (1863), who applied the res ipsa loquitur doctrine for the first time. Yet many states retain some common law crimes. For example, in Virginia, the definition of conduct that constitutes the crime of theft exists only in the common law, and the robbery law only sets the sentence.  Section 1-200 of the Virginia Code establishes the continuity and vitality of the principles of the common law and provides that „the common law of England, so far as it is not contrary to the principles of the Bill of Rights and the Constitution of this Commonwealth, shall remain in full force and effect in the same Commonwealth and shall be the rule of decision. unless amended by the General Assembly. An admission law is a law passed when a former British colony becomes independent, by which the new nation adopts (i.e. receives) the pre-independence common law, unless it is expressly rejected by the legislature or constitution of the new nation. Admission laws generally regard pre-independence English common law and the resulting precedent as standard law, as it is important to use a comprehensive and predictable law to regulate the conduct of citizens and businesses in a new state.
All U.S. states, with the partial exception of Louisiana, have either passed admission laws or passed common law by court notice.  The investigating judge then submits the file with his conclusions to the President of the Chamber, who decides on the case in which it was decided that the proceedings should be conducted. Therefore, the view of the President of the Chamber on the case is not neutral and may be biased in the conduct of the proceedings after reading the file. Unlike common law procedures, in the Inquisition system, the presiding judge is not only an arbitrator and has the right to examine witnesses directly during the trial or to comment, as long as he does not comment on the guilt of the accused. In common law jurisdictions, lawyers and judges tend to use these documents only as „finding aids” to locate relevant cases. In common law jurisdictions, academic work is rarely cited as an authority on what law is.  Roberts C.J. noted the „great gap between academia and the profession.”  When common law courts rely on scientific work, this is almost always done only for findings of fact, political justifications, or the history and development of the law, but the court`s legal conclusion is drawn by analysis of the relevant statutes and the common law, rarely by scholarly commentary.
With the transition from English law, which provided for common law crimes, to the new legal system of the United States Constitution, which prohibited retrospective laws at the federal and state levels, the question arose as to whether there could be common law crimes in the United States. She was tried in United States v. Hudson, who held that federal courts do not have the power to define new common law crimes and that there must always be a (constitutional) law defining the offence and the penalty for it. The first definition of „common law” in Black`s Law Dictionary, 10th edition, 2014, is: „All law arising from judicial decisions and not from laws or constitutions; [synonym] JURISPRUDENCE, [contrast] STATUS”.  This usage is given as the first definition in modern legal dictionaries, is considered the most „common” usage among lawyers, and is the usage often seen in court decisions.     In this connotation, „common law” distinguishes authority that a statute has promulgated. For example, in most Anglo-American jurisdictions, legislation includes „statutory law” enacted by a legislature, „regulatory law” (in the United States) or „delegated legislation” (in the United Kingdom) enacted by executive authorities pursuant to the delegation of regulatory powers by the legislature, and common law, or „jurisprudence,” that is, decisions of courts (or quasi-judicial within agencies).  This first connotation can be distinguished by: Scotland is often said to use the civil law system, but it has a unique system that combines elements of an uncodified civil law from the Corpus Juris Civilis with an element of its own common law, dating well before the Treaty of Union with England in 1707 (see Law Institutions of Scotland in the High Middle Ages). on the basis of the customary laws of the tribes that live there. Historically, Scottish common law has differed in that the use of precedent depended on the courts trying to discover the principle justifying a statute, rather than looking for an example as a precedent, and the principles of natural justice and fairness have always played a role in Scottish law. From the 19th century onwards, the Scottish precedent evolved into a stare decisis, similar to that already established in England, reflecting a narrower and more modern approach to the application of case law in later instances.
This is not to say that the substantive rules of the common laws of the two countries are the same, but they are similar in many areas (particularly those of British interest). Louisiana criminal law is largely based on English common law. The administrative law of Louisiana is generally similar to the administrative law of the U.S. federal government and other U.S. states. Louisiana`s procedural law is generally consistent with that of other U.S. laws. , which in turn are generally based on the U.S. Federal Rules of Civil Procedure.
After partition, Pakistan maintained its common law system.  Publication of decisions and indexing are essential to the development of the common law and, as a result, governments and private publishers publish legal reports.  While all decisions rendered in common law countries constitute precedents (at different levels and to varying degrees, as discussed in the precedents article), some become „principal cases” or „landmark decisions” that are cited particularly frequently. The U.S. federal government (as opposed to the states) has a variant of a common law system. In the United States, federal courts function only as interpreters of law and the Constitution, crafting and precisely defining broad legal language (connotation 1(b) above), but not as an independent source of common law, unlike state courts. Until much of the 19th century, old maxims played a major role in common law jurisprudence. Many of these maxims have their origins in Roman law, emigrated to England before Christianity was introduced to the British Isles, and were even generally formulated in English decisions in Latin. Many examples are still known today in everyday language: „One cannot be a judge in one`s own case” (see the case of Dr. Bonham), rights are reciprocal with duties and others.
Judicial decisions and treatises of the 17th and 18th centuries, such as those of Lord Chief Justice Edward Coke, have presented the common law as a collection of such maxims. While still serving on the Massachusetts Supreme Court and before being appointed to the U.S. Supreme Court, Justice Oliver Wendell Holmes Jr. published a short volume entitled The Common Law, which remains a classic in the field. Unlike Blackstone and the Restatements, Holmes` book deals briefly with what the law is; Instead, Holmes describes the common law process. Law professor John Chipman Gray`s The Nature and Sources of the Law, a study and inquiry into the common law, is also widely read in American law schools. If a tort is rooted in the common law, all damages traditionally recognized for that tort may be prosecuted, whether or not such damages are mentioned in the applicable law. For example, a person who suffers bodily injury as a result of another person`s negligence may sue for medical expenses, pain, suffering, loss of earnings or earning capacity, psychological and/or emotional distress, loss of quality of life, disfigurement, etc. These damages do not need to be set by statute because they already exist in the common law tradition. However, without an unlawful death law, most of them expire upon death.
Ghana has not abolished the common law system inherited from the British after independence and is now enshrined in the country`s 1992 constitution. Chapter Four of the Ghanaian Constitution, entitled „The Laws of Ghana”, contains in Article 11(1) the list of laws applicable in the State. These include (a) the Constitution; (b) Decrees issued by or under the control of the Parliament established by the Constitution; (c) All orders, rules and regulations issued by a person or authority by virtue of a power conferred by the Constitution; (d) applicable law; and (e) the common law.  Thus, Ghana`s modern constitution, like previous constitutions, adopted English common law by enshrining it in its provisions. The doctrine of judicial primacy, based on the principle of stare decisis, as applied in England and other pure common law countries, also applies in Ghana.